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Questions tagged [binary-star]

Questions regarding a pair of stars that are gravitationally bound and orbit around their barycenter.

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HR 6819 "Vampire" star - mass disparity in binary star system

Regarding the two B-type stars of the HR 6819 system, a recent news item (2 March 2022), European Southern Observatory researchers find 'vampire' star sucking outer layers of companion star states, ...
Fred's user avatar
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5 votes
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Is Beta Lyrae still thought to be losing mass in a spiral outflow?

In the famous 1960 painting by Chesley Bonestell, Beta Lyrae is depicted with a glowing spiral trail of matter emanating from the binary stars. I'm wondering if that's still thought to be a ...
user avatar
4 votes
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132 views

Why do double neutron stars remain bounded?

I read that in principle, the formation of a double neutron star requires that at the time of the second supernova explosion the binary consists of a $\sim$ 1.4 solar mass neutron star, and a second ...
some_math_guy's user avatar
4 votes
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28 views

Limb darkening coefficients for BRITE and Johnson:V passbands

Where to find limb darkening coefficients for BRITE and Johnson:V passbands, please? Do any tables exist or are there any relations for their guest? Many thanks
Carly's user avatar
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How to determine the time of periastron passage (T) of a single lined spectroscopic binary?

I am working on finding spectroscopic elements of a single lined spectroscopic binary. All I have is irregularly spaced radial velocity data which needs to be phase folded to plot a velocity curve (RV ...
ShaunakP's user avatar
3 votes
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125 views

Two Suns vs Two moons in the Sky

How rare is it to have 2 stars or 2 celestial bodies at least as big as our moon and sun in the sky of a habitable planet? What are the chances of both?
Justintimeforfun's user avatar
3 votes
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90 views

Are there any binary red supergiants?

I wonder if we ever have identified or observed a pair of binary stars (red supergiants). And I also wonder what would happen if they exploded, (theoretically) as we haven’t observed it. Also, would ...
schrodingerscat's user avatar
3 votes
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53 views

How to distinguish primary hosts (stars) and orbiting satellites (planets) and tertiary bodies (moons) by their mass and trajectory?

Suppose one has run a gravitational simulation of N bodies (has the mass, vector positions, vector velocities, etc for each body), but knows nothing a priori about ...
zeebeel's user avatar
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Combined mass of binary stars

This is Question 17 from USAAAO Practice Round 2015. The answer is D. It would be best if someone can detail out the workings. In a nearby star system, two stars are seen to orbit each other every ...
Chooi Je Qin's user avatar
2 votes
0 answers
64 views

Single, binary, triple, .. fraction of star systems in our galaxy by mass

What is the fraction of single, binary, triple and so on systems as a function of one of the stars masses (or their sum)? This can be either derived from simulation or measurement. I feel like I have ...
SpaceCore's user avatar
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2 votes
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T Coronae Borealis

As it will explode this year or so, I became interested in the binary T Coronae Borealis. According to wikipedia, https://en.wikipedia.org/wiki/T_Coronae_Borealis R Cor Bor the binary masses are 1.34 ...
riemannium's user avatar
2 votes
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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 ...
Elhammo's user avatar
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2 votes
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365 views

How to calculate orbital velocity of binary star?

I am trying to simulate the Alpha Centauri AB System. I built the simulation, it works flawlessly when trying to simulate our solar system, and I am now trying to simulate the AB System. I found all ...
Marc Klemm's user avatar
2 votes
0 answers
49 views

Did Gaia DR3 help figure out whether Albireo is an optical double?

Based on the Wikipedia page of Albireo, Gaia DR2 had too much noise to determine whether the stars are physically associated or if they are just an optical double. Gaia DR3 was released last year. ...
usernumber's user avatar
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2 votes
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155 views

Virial theorem for a binary system

I am trying to derive the virial theorem but for two stars orbiting each other. I know the derivation for the general virial theorem with i particles but I am wondering if there is a quicker or more ...
I Love Math's user avatar
2 votes
0 answers
55 views

Spurious periods of stars

What exactly is meant by spurious periods of stars? E. Tanner writes in Spurious Periods in Spectroscopic Binaries in 1948 Furthermore: Can spurious periods be produced by aliasing, and how can they ...
Junaid Ihsan's user avatar
2 votes
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24 views

Relation between inner and outer eccentricities in a hierarchical triple star system

According to Table 3 of Sterzik & Tokovinin (2002), the inner eccentricity of a triple star system (i.e. the eccentricity of the inner binary) is, most of the times (70%), larger than the outer ...
Carlos Vázquez Monzón's user avatar
2 votes
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86 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 - ...
Alex's user avatar
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2 votes
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60 views

Could an Applegate-like mechanism operate in AM CVn systems?

One of the controversies surrounding the detection of exoplanets around post-common envelope binaries is the possibility that the orbital period variations observed might be the result of the ...
user avatar
2 votes
0 answers
93 views

Depth of primary and secondary minimum in a light curve

How can I explain approximately the same depth of primary and secondary minimum in light curve? I observe star HD 36486. I tried filters MOST and BRITE. Is it related with photometric filter? When ...
Lukáš Altman's user avatar
1 vote
0 answers
26 views

How can I use SDSS archive to find the radial velocities of binary stars?

I need to plot a radial velocity curve of a given binary star system, and I think that the SDSS apogee survey has what I need, but I havent had any luck finding anything on it. It this the right tool ...
Zandini3's user avatar
1 vote
0 answers
46 views

How do changing binary separation and Roche Lobe size of the donor affect the long-term evolution of a binary under conservative mass transfer?

I computed that for a binary system that undergoes conservative mass transfer from the Roche-lobe filling Start 2 to Star 1 (i.e. $\dot M_2<0, \dot M_1=-\dot M_2$ and the change in angular momentum ...
some_math_guy's user avatar
1 vote
0 answers
27 views

V magnitude of binary components

Which catalog provides visible magnitudes of binary components, please? How to find it, for instance, in VizieR, please? I have a list of binaries.
Anna-Kat's user avatar
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1 vote
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Does latitude affect the sunset times between binary stars

Basically, if a binary system's stars sunset an hour apart at the equator, would they still set an hour apart in a much farther north latitude where the daylight lasts longer or is it still an hour ...
Dsport's user avatar
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1 vote
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17 views

Transit Timing Variation data for binaries

Where can I find transit timing variation data (TTV) for binaries, please? Is there any database? Thanks a lot.
Elena Greg's user avatar
1 vote
0 answers
59 views

What happens if supernova undergoes in tightly close multi stars system

I do wonder in a tight or close orbital binary stars or multi stars system, if one stars undergoes supernova and that blast can lead another stars in the system to become supernova, too? Is there ...
Aung Satt's user avatar
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240 views

Relationships between G magnitude, Johnson V magnitude, and spectral type of stars?

I'm simulating a population of binary stars for a summer research project. I'm adding uncertainties to my simulated observables such as angular position and radial (line of sight) velocity. I'm using ...
Sofia Splawska's user avatar
1 vote
0 answers
59 views

How likely are triple planet systems?

Is it likely to ever discover three planets of similar mass revolving around a common barycenter, or would such a system be too unstable? Such triple planet system would look like a triangle once in a ...
Giovanni's user avatar
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1 vote
0 answers
56 views

Visual binary star with circular apparent orbit

Does anyone know a good example of visual (or interferometric) binary star apparent orbit of which looks circular due to projection though in fact is markedly elliptical? I need that for teaching.
Leos Ondra's user avatar
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1 vote
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85 views

What is the relation between between hardness ratio(HR) and spectral state of a X-ray binary star system?

When reading about hardness ratio, it shows that depending on the hardness ratio spectral states of a binary star can be divided into soft, hard states. So how the HR value changes with respect to the ...
Monkey King's user avatar
1 vote
0 answers
193 views

6th catalogue of orbits of visual binary stars

I wanted to download or access the US navy catalog " the sixth catalog of orbits of visual binaries". I have already tried USNO web site and vizier. but I couldn't see them there. The link was dead ...
Jiswin's user avatar
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1 vote
0 answers
96 views

Binary stars and gas giant formation

Say there's a young s-type binary star system with 2 Sun-like stars. From what I understand for a stable orbit to be possible, a planet's farthest orbital point from its host star has to be around 1/5 ...
Xanax87's user avatar
  • 68
1 vote
0 answers
122 views

Binary planet orbital distance

From reading various sources online, I see that some people talk about binary planets in very tight orbits (around 1 or 2 planet radii). I am wondering if it is possible for a binary planet (Double ...
Markitect's user avatar
  • 305
1 vote
0 answers
90 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)...
user29126's user avatar
1 vote
0 answers
36 views

How accurate are the new visualisations of V404 Cygni

A number of pictures and some animations similar to the ones below have had much press recently. Clearly the colours are artificial, but I wondered how accurately the represent the geometry of the ...
Steve Linton's user avatar
  • 10.3k
1 vote
0 answers
64 views

Total angular momentum in system of binary brown dwarfs on wide orbit from primary star

I want to calculate the total angular momentum of a system in which two brown dwarfs are orbiting one another (P ~ 10 years), and this system is stably orbiting a third primary ZAMS star (P ~ $10^4$ ...
voidedbowel's user avatar
1 vote
0 answers
133 views

The black hole binary that was detected by advanced LIGO - how do such hypergiant binaries form?

With today's announcement of the historic detection of gravitational waves from the merger of 36 solar mass and 29 solar mass black holes 1.3 billion light years away, one can not help but wonder how ...
dualredlaugh's user avatar
0 votes
0 answers
43 views

Accretion disk formation

Why a mass transfer in a binary star system, from the less dense star to the denser star forms an accretion disk? Why the material does not fall directly to the denserstar?
Niche's user avatar
  • 17
0 votes
0 answers
167 views

2-body orbits expanding in nbody simulation?

Recently, I designed an n-body engine and tested it with a binary star system. After a minute of running, the orbit began noticeably expanding: Why is it happening, and is this natural? The source ...
WarpPrime's user avatar
  • 6,683
0 votes
0 answers
57 views

Binary star system effects at the barycenter

I haven't been able to find anything on this so far. Using Alpha Centauri as the study, what events/effects ( if any ) would happen between the two stars? More specifically, between the gravitational ...
Markitect's user avatar
  • 305