User Astroturf

11 votes

2 answers

1k views

Which stellar properties can we describe as "first principles" in which we can derive the rest?

asked Jul 21, 2020 at 19:36

6 votes

1 answer

396 views

Why do M dwarfs emit more X-ray radiation than larger, more luminous stars?

asked Feb 24, 2021 at 11:04

6 votes

2 answers

659 views

Why is blue light extincted more strongly than red?

asked Jan 26, 2020 at 21:58

5 votes

1 answer

223 views

What leads an observer to choose a narrow slit over a wide one (and vice-versa) when observing?

asked Apr 5, 2021 at 2:08

5 votes

0 answers

133 views

Explain as simply as possible how the Sunyaev-Zeldovich (SZ) effect is used to estimate the Hubble constant

asked Jun 22, 2021 at 2:11

5 votes

1 answer

358 views

If the visibility function is the Fourier transform of the sky brightness distribution, why do you need the dirty beam and dirty image to find it?

asked Jul 14, 2021 at 19:50

5 votes

1 answer

322 views

Which star has the faintest absolute magnitude (largest magnitude) yet is still visible with the naked eye from Earth (either hemisphere)?

asked Aug 2, 2021 at 16:43

5 votes

2 answers

525 views

Why would someone choose a lower resolution grating over a higher one when performing spectroscopy?

asked Aug 10, 2021 at 23:05

5 votes

1 answer

119 views

Why do massive rapid-rotating stars move bluewards off the zero-age main sequence (ZAMS)?

asked Feb 23, 2021 at 16:52

4 votes

1 answer

122 views

What is the significance of using baseline pairs in radio interferometry?

asked Apr 5, 2021 at 18:56

4 votes

1 answer

1k views

What is the significance of the velocity resolution in spectral line observations using radio interferometry?

asked Apr 12, 2021 at 16:03

4 votes

2 answers

241 views

Does the density in the core of a "higher mass" star stay generally constant while it evolves on the MS?

asked Jun 12, 2019 at 19:45

3 votes

0 answers

264 views

Why do blue horizontal branch stars turn downwards on the HR diagram as opposed to red horizontal branch stars which remain fairly constant?

asked Jul 27, 2021 at 20:23

2 votes

0 answers

401 views

How to convert between surface density in JY/beam*KM/S / arcsec2 to mass surface density in Solar masses / pc2

asked Mar 25, 2022 at 21:40

2 votes

0 answers

91 views

How can I compute reasonable errors on my Gaussian fits to the observed strong optical lines of interest?

asked Aug 14, 2023 at 18:18

2 votes

1 answer

196 views

When is the best time to observe M81 from the Northern Hemisphere?

asked Nov 20, 2019 at 23:15

2 votes

2 answers

121 views

How can I make the fringing pattern visible in my flat (twilight) images for filter i?

asked Jun 6, 2020 at 19:25

2 votes

1 answer

177 views

Why does this nucleogenesis table not label s and r-processes for all elements (not-labmade) past Fe?

asked Mar 24, 2021 at 18:55

2 votes

0 answers

77 views

How do we know or predict which particles were present before Big Bang Nucleosynthesis occurred?

asked Apr 19, 2021 at 18:56

2 votes

1 answer

92 views

How do the stars in the near-infrared (NIR) radiate?

asked Jun 18, 2021 at 22:58

2 votes

1 answer

146 views

In radio astronomy, why do shorter baselines trade angular resolution for surface brightness?

asked Jul 14, 2021 at 2:29

1 vote

1 answer

100 views

How to determine the color term for a filter with a systematically bluer offset than the standard

asked Jul 24, 2021 at 22:53

1 vote

1 answer

158 views

How to approximate the distance at which the thin disk peaks along a given LOS from Earth for a given galactic coordinate per 1 sq deg?

asked Aug 2, 2020 at 21:40

1 vote

2 answers

215 views

How are younger objects outside our observable universe when the older CMB is an observer's temporal "edge"?

asked Sep 8, 2020 at 1:06

0 votes

0 answers

738 views

How can one determine the declination range of stars visible for a certain amount of time above a specific airmass at a certain location?

asked Jan 1, 2020 at 0:43

Stack Exchange Network

25 Questions

Which stellar properties can we describe as "first principles" in which we can derive the rest?

Why do M dwarfs emit more X-ray radiation than larger, more luminous stars?

Why is blue light extincted more strongly than red?

What leads an observer to choose a narrow slit over a wide one (and vice-versa) when observing?

Explain as simply as possible how the Sunyaev-Zeldovich (SZ) effect is used to estimate the Hubble constant

If the visibility function is the Fourier transform of the sky brightness distribution, why do you need the dirty beam and dirty image to find it?

Which star has the faintest absolute magnitude (largest magnitude) yet is still visible with the naked eye from Earth (either hemisphere)?

Why would someone choose a lower resolution grating over a higher one when performing spectroscopy?

Why do massive rapid-rotating stars move bluewards off the zero-age main sequence (ZAMS)?

What is the significance of using baseline pairs in radio interferometry?

What is the significance of the velocity resolution in spectral line observations using radio interferometry?

Does the density in the core of a "higher mass" star stay generally constant while it evolves on the MS?

Why do blue horizontal branch stars turn downwards on the HR diagram as opposed to red horizontal branch stars which remain fairly constant?

How to convert between surface density in JY/beam*KM/S / arcsec2 to mass surface density in Solar masses / pc2

How can I compute reasonable errors on my Gaussian fits to the observed strong optical lines of interest?

When is the best time to observe M81 from the Northern Hemisphere?

How can I make the fringing pattern visible in my flat (twilight) images for filter i?

Why does this nucleogenesis table not label s and r-processes for all elements (not-labmade) past Fe?

How do we know or predict which particles were present before Big Bang Nucleosynthesis occurred?

How do the stars in the near-infrared (NIR) radiate?

In radio astronomy, why do shorter baselines trade angular resolution for surface brightness?

How to determine the color term for a filter with a systematically bluer offset than the standard

How to approximate the distance at which the thin disk peaks along a given LOS from Earth for a given galactic coordinate per 1 sq deg?

How are younger objects outside our observable universe when the older CMB is an observer's temporal "edge"?

How can one determine the declination range of stars visible for a certain amount of time above a specific airmass at a certain location?