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5h
comment close binaries could have a very eccentric orbit?
@rob I have revise the question. Do you have any idea now?
5h
revised close binaries could have a very eccentric orbit?
deleted 1 character in body
15h
asked close binaries could 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.
Apr
22
revised How can we derive photometric redshift?
deleted 2 characters in body
Apr
22
comment which or what kind of star has a very stable luminosity?
so statistically, younger stars should rotate faster and high level magnetic activities? But I know M&K stars are more magnetically active. Also, age-activity relation is not necessarily true for a single star.
Apr
22
revised How can we derive photometric redshift?
added 15 characters in body
Apr
22
asked How can we derive photometric redshift?
Apr
21
comment What's the difference between grism and grating?
I know that link. What is the function of a prism? A prism itself is enough to disperse light.
Apr
21
asked What's the difference between grism and grating?
Apr
16
comment How to differentiate between images of a gravitationally lensed object
If it is a microlensing event, we can distinguish from the shape of its light curve. How about non-microlensing event?
Apr
16
comment How to differentiate between images of a gravitationally lensed object
how to tell a lensing is there if a point source's arc is not obvious and its shape is not distorted?
Apr
2
comment how to tell an optical spectrum is featureless or just with a low S/N?
@Rob Just according to a featureless spectrum itself, we are not able to know whether it is caused by a featureless star or the spectrum is just has a low s/n, right?
Apr
2
asked infrared telescopes, magnitude and observations
Apr
2
revised how to tell an optical spectrum is featureless or just with a low S/N?
edited title
Apr
2
asked how to tell an optical spectrum is featureless or just with a low S/N?