Questions tagged [star-systems]
Questions regarding two or more stars gravitationally bound to each other
93
questions
14
votes
5
answers
4k
views
Why can't a half-illuminated planet support life at all?
Here is my own translation of the Polish version of the Drake equation article in Wikipedia:
(...) They must provide the right amount of heat. The smaller the star, the less heat it gives off and the ...
- 251
2
votes
0
answers
54
views
Is there an assessement of chemical element availability in other star systems?
This question is linked to my previous question about star metallicity’s link to the chemical element availability in that star’s planetary system: Is there a link between a star's metallicity and ...
6
votes
2
answers
1k
views
What determines the edge/boundary of a star system?
According to Education.nationalgeographic, "A star system is a group of planets, meteors, or other objects that orbit a large star. While there are many star systems, including at least 200 ...
- 69
2
votes
1
answer
1k
views
It's 12 June 2023, almost 11 PM... location: Chitral, KPK, Pakistan. What constellations, celestial objects can you identify in this picture. Help
This picture is taken from Chitral District of KPK, Pakistan... Time: 12 June 2023, 11PM approximately ...I want you to tell me what constellations, celestial objects can you identify in it?
2
votes
3
answers
167
views
Is there a link between a star's metallicity and the availability of chemical elements in its system?
Considering aspects of interstellar trade for worldbuilding purposes, I'm researching what resources might be available in each star system.
The premise is that if one star system has an abundance of ...
2
votes
0
answers
120
views
How did people in Mali know that there were two stars appearing as one in Sirius before telescopes were invented?
Did they invent a telescope and keep it quiet?
Given that glass has been around for 4000 years (made in mesopotamia in 2000 BC) was it technically possible to polish it and make convex shapes from it ...
user50918
-2
votes
1
answer
61
views
Can a star with a stellar mass of 1.176 with a similar composition to the Sun have a planet with these characteristics?
Imagine a solar system similar to ours that has a star with a similar composition to the Sun and a stellar mass of 1.176 and an Earthlike planet with about 1.18 times the mass of Earth in its ...
- 113
15
votes
2
answers
2k
views
Are stars attracted to one another by their magnetic fields?
What effect do the magnetic fields of stars have on one another:do they tend to repel or attract one another?
user50918
2
votes
1
answer
505
views
Did the Grus star get expelled from the Milky way because it was accelerated by the Sagittarius A black hole?
On Wikipedia there is an article that says a star may have been expelled from the Milky Way because it interacted with Sagittarius A.
Sagittarius A* from Wikipedia:
In July 2019, astronomers reported ...
user50918
1
vote
1
answer
73
views
When gravitational waves pass through a star or gas cloud do they cause mixing of plasma and gas?
Does the compression and stretching of space stir up molecules and atoms?
user50918
0
votes
0
answers
49
views
Do whirlpools of turbulence exist in stars just like the whirlpools that exist in water?
Is there turbulence in the hot plasma and gas of stars that is mathematically the same as whirlpools in water?
user50623
2
votes
1
answer
109
views
Why are the largest stars, such as O-type or B-type, most likely to be in multi-star systems; while red dwarfs are least likely?
I was just reading about what percentage of stars in our galaxy and, perhaps, other galaxies are in binary systems (or trinary... etc.).
Researchers keep going back and forth about whether or not most ...
- 4,891
1
vote
1
answer
65
views
Calculating the expected lifespan for a binary system
I’m doing some research work on finding a correlation between the mass of binary stars and their lifespan. I have methods to find the mass, and that department seems to be going fine, but is there a ...
- 11
2
votes
0
answers
60
views
If a planet orbits an M-Star in an S-type orbit around a G star, what is the minimum distance from the G star that it could remain tidally locked?
I'm wondering how close a planet-M-dwarf system could orbit a G star and have the planet remain tidally locked to the M star. I'm curious, because I'm designing a habitable planet, and I want the ...
- 1,087
0
votes
2
answers
78
views
When calculating the mass of stars, is it considered that additional mass could be added because of pair-production?
I would like to know that, since stars emit a lot of photons where some of them could be producing electrons-positrons pairs, if its mass affects the calculations, and if because of this is different ...
- 133
5
votes
1
answer
181
views
What does a + (plus) mean in stellar classification?
I've noticed some stellar classifications might look like this:
A0IV+G: (HD 70003)
F3IV+F0IV (HD 82434)
...
- 357
1
vote
1
answer
834
views
how much time do Alpha Centauri A and B have?
According to Wikipedia:
Alpha Centauri A: $M=1.100 M_\odot$ and $L = 1.519 L_\odot$
Alpha Centauri B: $M=0.907M_\odot$ and $L=0.5002L_\odot$
They are 5-6 billion years old (you can assume they are 5.5 ...
2
votes
1
answer
146
views
Binary Star System
If our Sun was a part of a Binary Star System, would it be too hot to live on Earth ? With two Suns, would we get double the heat from them ,than from our Sun alone ?
- 1,599
5
votes
3
answers
552
views
Nomenclature of Interstellar Objects and Stars
I posted this question on the space exploration SE but people recommended that it would be more on-topic here. Could someone please help by giving some definite laws of nomenclature for celestial ...
3
votes
1
answer
102
views
Virial ratio behaviour
I think I didn't understand something about virial theorem for an $N$-body system, for instance the behaviour of virial ratio $T/\Omega$, with $T$ kinetic energy and $\Omega$ gravitational potential ...
- 43
5
votes
3
answers
841
views
What is the upper bound of number of stable interacting stars in a star system?
I remember very well reading in an article that it's impossible to have a stable star system of 4 or more stars. The article justified its claim discussing about the complexity such systems would have ...
- 883
6
votes
1
answer
94
views
Does a star's rotation always match a planet's orbit?
For a planet orbiting a star, is it ever possible for a star to be rotating in the opposite way on it's own axis compared to the planet that is orbiting the star?
Or do gravitational forces mean the ...
- 415
1
vote
2
answers
154
views
Eta Cassiopeiae star type; G0V? F9V? Both?
For a story I am looking into the star system of Eta Cassiopeiae, which is a binary with a main sequence star called Achird (very similar to the sun) and a K7V star.
The issue I am running into is the ...
- 305
1
vote
2
answers
136
views
Fate of lone spiral galaxies?
I know Hubble's galaxy classification scheme and the bifurcation from elliptical galaxies into two types of spiral ones. I am also aware of different theories on how spiral galaxies form e.g. through ...
- 5,526
3
votes
1
answer
129
views
What are hot and cold stellar systems?
My idea of the matter is: hot stellar systems are which form of objects which have a velocity standard deviation comparable to their mean velocity. Is this correct? If it is, is there a $\frac{\...
- 481
2
votes
2
answers
168
views
Celestron Nexstar 102GT
Good day folks.
My Grandson would like to start using this Telescope Celestron Nexstar GT102, has been in the basement for years, and unfortunately, we appear to have misplaced the eyepieces.
Just ...
- 21
3
votes
1
answer
1k
views
Is it possible to have a trinary star system with a planet that orbits their barycenter?
I am trying to model a 3-star system with a planet. The three stars have the same mass. I have gotten the stars (Yellow, Pink, Blue) into a stable orbit. However, I am wondering if a "free-...
- 6,613
7
votes
3
answers
929
views
Why are stars still distant from one another? [duplicate]
Why are stars so far from each other? Shouldn't gravity pull them closer over time? And if the effects of gravity are negligible is there an explanation why stars have to be so distant from one ...
- 355
2
votes
1
answer
173
views
Fractional contribution of secondary star
What do we mean by "the luminosity fraction" and "the fractional contribution of the secondary star" of binary stars? can anyone suggest any method to calculate them theoretically?...
- 177
9
votes
1
answer
716
views
Why is detecting brown dwarfs difficult?
Why is detecting brown dwarf stars tedious and not always successful? They emit light in the infrared region, and given that we're surrounded by state-of-the-art technology in space today, why haven't ...
- 793
42
votes
1
answer
5k
views
Closest star system to Alpha Centauri?
The closest star system to our Solar System is Alpha Centauri.
But is our Solar System the closest star system to Alpha Centuari?
If not, which star system is?
- 523
2
votes
1
answer
1k
views
How many stars are there max and average per galaxy?
What is the range of the number of stars possible in a galaxy? What is the rough average?
Googling leads to vague answers, things like "billions upon billions". But what is a more pinpointed set of ...
- 215
2
votes
0
answers
77
views
PHOEBE 2.2 Documentation, components and semi-major axis definitions
I'm looking at PHOEBE 2.2 Documentation, specifically at a tutorial about constraints
What are Constraints?
Constraints live in their own context of the Bundle, and many are created by default - ...
- 155
3
votes
2
answers
252
views
How Does Earth Move In Relation To The Stars
In my simulation, I have stars scattered around Earth, all stars are the same distance from the center of the Earth and positioned based on their right ascension and declination like so:
I am ...
- 225
5
votes
0
answers
79
views
Can mean motion resonances make orbits more unstable rather than more stable?
This paper on closely packed orbit simulation seems to suggest that having the planets in first and second order resonances decreases the time till orbits cross each other. I'd got the impression that ...
- 345
0
votes
2
answers
13k
views
About more than 15 stars moving in straight line through the sky [duplicate]
I had seen more than 15 stars are moved in a straight line through the sky just like a train. And the distance between each star was not same, some of them were near and some of them were far. The ...
- 9
1
vote
0
answers
73
views
Derivation of a formula for the mass of a tidal bulge and tidal torque
I've been looking into the tidal mechanism for a binary star system and seem to have hit a brick wall. In the literature (see below), little explanation is given to justify the equations (9.60), (9.61)...
- 39
1
vote
1
answer
126
views
Maxwell stress contribution to $\nabla \cdot \mathbf{P}$ in the Navier-Stokes equation for fluid in stars
I was reading through the following extract outlining how the Maxwell stress contributes to the $\nabla \cdot \mathbf{P}$ term of the Navier-Stokes equation for fluids in a star. Here $\mathbf{P}$ is ...
- 39
14
votes
3
answers
6k
views
Why are there no stars visible in cislunar space?
It’s very puzzling that the moon landing had no stars in the background, the ISS clips have no stars in the background. I listened to multiple astronaut interviews speak on what it looks like up in ...
- 523
1
vote
0
answers
33
views
Data on galactocentric distances of various stars?
I'm creating a project for my astronomy class (introductory course) that requires knowledge of the galactocentric distances for many stars. I'm struggling to find a good source on this, and I'd rather ...
- 11
3
votes
0
answers
88
views
Can any type of stars be contact binaries?
In this article Shortest distance between stars it is mentioned that
Some double stars can actually be in contact with each other.
This occurs when a red giant star has a white dwarf star ...
- 1,019
2
votes
1
answer
227
views
How many arc seconds is Sirius "spiralling motion" around Sirius B?
I know that Sirius A and B orbit each other. I'd like to ask how large is their relative apparent motion in arc seconds, seen from Earth?
- 89
6
votes
2
answers
586
views
What happens when a star gets hit by a supernova?
This may sound like a strange question, but say that two stars are relatively next to one another in a binary star system, what would happen to one of the stars if the other went supernova? Would it ...
- 235
3
votes
1
answer
177
views
Recognising lunar month only by looking at the sky
Suppose somebody went on an island and don't have sense about time, dates, months. The only thing he has is seeing the sky. Is it possible to recognise which lunar month it is by just looking the sky?
...
- 139
2
votes
2
answers
311
views
Do all orbiting objects have barycenters?
From the simple perspective of someone like myself, it appears that our sun is "fixed in place" (from the perspective of the solar system itself) and that everything else of lower mass orbits around ...
- 552
0
votes
2
answers
109
views
What is the official classification and naming system of objects in the universe(, or what would my URI look like)?
Poetic human centric approach:
Universe/Laniakea/Virgo/MilkyWay/Sol/Earth/Humans/AndreasT
Little bit more technical:
...
- 101
1
vote
1
answer
143
views
Where do gas giants end up?
I want to create a semi realistic star system generator but I am not sure where to "put in" gas giants. My guess is they can form pretty much anywhere within the sphere of influence of a star at the ...
- 111
1
vote
1
answer
164
views
H-R diagram, Double stars
Can someone help me? I have a case, like, we have H-R diagram and two stars on it. One of them is a blue star on main sequence, another is a red giant. They have equal luminosity. If they are in a ...
- 21
5
votes
2
answers
2k
views
Trisolar syzygy and it's effects on the planet
Slightly spoilers here, but in the novel The Three-Body Problem, there's a scene in which Civilization #184 is destroyed by the stacked gravitational attraction of the planet's (aptly named Trisolaris)...
- 185
-1
votes
1
answer
160
views
Color changing celestial body near the moon [closed]
While I was star gazing yesterday in the night time I observed a celestial body( probably a star ) flaunting various colors and was residing near the moon from the angle I saw it. It appeared to be ...