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  • 31 votes cast
May
25
comment why are solar telescopes built on lakes? the site differnece between a solar and an optical telescope
@Mitch not just big bear, there are other examples. I know optical and solar telescopes consider different factors, but do not know what factors exactly.
May
25
revised why are solar telescopes built on lakes? the site differnece between a solar and an optical telescope
edited body
May
25
revised why are solar telescopes built on lakes? the site differnece between a solar and an optical telescope
added 124 characters in body; edited tags; edited title
May
25
asked why are solar telescopes built on lakes? the site differnece between a solar and an optical telescope
May
3
comment Can close binaries have a very eccentric orbit?
I have sent the right pdf to you.
May
3
comment Can close binaries have a very eccentric orbit?
you are very professional. How can you find them so quickly? There are two binaries which are not so young, adsabs.harvard.edu/abs/2014ApJ...788..134K and adsabs.harvard.edu/abs/2015IBVS.6138....1C, especially the 2rd one. Kozai mechanism is suppressed for very short period binaries. Could you please say more about "an injection of energy via a dynamical interaction"?
Apr
29
comment Could our Sun be a companion star of a massive black hole?
@joan I am looking for useful comments or suggestions. It is a dumb question? I learned a lot from Walter's comment. How about yours?
Apr
28
comment Could our Sun be a companion star of a massive black hole?
@rob there are visible tidal effects on our solar system now? Anything weird happens in our solar system?
Apr
28
comment Could our Sun be a companion star of a massive black hole?
@rob yes, not necessarily 1000M⊙. How much is the max(mass) that we can exclude currently?
Apr
28
comment Could our Sun be a companion star of a massive black hole?
You are very professional, haha. What I asking is an unusual case. Let me put it this way. Can we tell there is a massive black hole nearby just based on the orbit of our sun? In sun's 3D velocity, there may be a small component caused by the black hole.
Apr
28
comment Could our Sun be a companion star of a massive black hole?
@user6760 Sar A* is 8 kpc away, man.
Apr
28
asked Could our Sun be a companion star of a massive black hole?
Apr
27
comment Can close binaries have a very eccentric orbit?
@rob I have revise the question. Do you have any idea now?
Apr
27
revised Can close binaries have a very eccentric orbit?
deleted 1 character in body
Apr
26
asked Can close binaries have a very eccentric orbit?
Apr
23
comment X-ray flare questions
not on our sun, it is unresolved. Could you please give examples or papers?
Apr
23
asked X-ray flare questions
Apr
23
comment Can asteroids contain atmosphere?
@ our moon may be a good example, although it is much larger than a typical asteroid. For a small object, gravity dominates? Asteroid Ceres may have tenuous atmosphere. But why do Titan with similar gravity have thick atmosphere? Whether there is thick atmosphere depends on what?
Apr
23
comment which or what kind of star has a very stable luminosity?
I admit old stars are active. But how about younger stars? They rotate faster, so there are more activities caused by magnetic field?
Apr
22
comment which or what kind of star has a very stable luminosity?
@ faster rotation means younger and more magnetic activities? But M&K are old. Besides, that age-magnetic relation should not be strictly followed by all the stars.