Astronomy C Question Marathon

[Smithy0013]

What is the mass limit for a white dwarf?
(Basic I know but bonus points if you can name a type1a that exceeded it)

[XJcwolfyX]

The Chandrasekhar Limit - 1.4 solar masses.

Example: Tycho's SNR.

[Crazy Puny Man]

Taken directly from one of my invite tests:

A binary star system at an inclination 10 degrees from our view line is noticed to have a separation of .5 AU and a observed value of 4016.23 angstroms for a wavelength that should be at 4000 angstroms from one star and an observed value of 3508.52 angstroms for a wavelength that should be at 3500 angstroms from the other star. Please compute:
a. The distance to the center of mass point from the larger star (meters)
b. The period of the system (seconds)
c. The mass of the larger star (solar masses)

[Smithy0013]

The Chandrasekhar Limit - 1.4 solar masses.

Example: Tycho's SNR.

Yes to the first part but I believe the second part is wrong. I think tycho snr exploded right at 1.4 solar masses. I could absolutely be very much mistaken though feel free to reply with a source. Further hint: the one i found is not one of our DSOs and it made a very nice song

[XJcwolfyX]

I misread the question, sorry, I thought you were just looking for an object that went Type Ia... my bad .

[Crazy Puny Man]

.

[Smithy0013]

wait since when is this astrology?

[XJcwolfyX]

Check the date

[Crazy Puny Man]

Anyone...?

[XJcwolfyX]

Yep, that's basically what I was looking for, showing that a Type I Cepheid would match the distance to M31 (I realize that question was kind of vaguely worded). syo and I, being crazy astro people, actually did those calculations to confirm what kind of Cepheid V1 was... instead of being reasonable people and looking it up.

Your turn!

I was taking a test (http://www.aavso.org/sites/default/file ... 202014.pdf) and it said that V1 was a W Virginis (Type II) star. I was confused on this but now I'm not sure looking at the math you guys did... Am I reading something wrong? (Question 50 on the test, and here is the answer key) http://www.aavso.org/sites/default/file ... %20Key.pdf.

ngc3132, the star in the image is about absolute magnitude 0.3 (at least the progenitor star is)

Edit: sorry people I am having major technical difficulties with my "hide" function so I'm just writing the answer out for the sake of transparency

Also where did that number come from?