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Astronomy C: Teams will demonstrate an understanding of stellar evolution in normal and starburst galaxies.

Astronomy Wiki

Astronomy Test Exchange 2018

Past Threads: 2009 (Variable Stars), 2010 (Galaxies), 2011 (AGNs), 2012 (Stellar Evolution & Type Ia Supernovae), 2013 (Stellar Evolution & Type II Supernovae), 2014 (Variable Stars & Stellar Evolution), 2015 (Star & Planet Formation), 2016 (Star Formation & Exoplanets), 2017 (Type Ia Supernova Events), 2018 (Type II Supernova Events)

Past Question Marathons: 2014, 2015, 2016, 2017, 2018

Chandra's webinars have been posted on its website, here. This year, they included a Stellar Evolution 101, using last year's DSOs as examples. It's definitely a pretty good resource, especially for beginners.

I can get so many questions out of 47 Tucanae...

This year looks like its going to be the best of my four years of doing Astronomy, in terms of experience, and content. Good luck to everyone!

Hey guys, I've been working on the DSO list this year and I've got a clarification question. DSO vi. on the list is SN2014, but there are 136 CBAT supernovae using that designation. I think the rules intend SN2014J, which was the brightest supernova of the year, but it doesn't specify.

If any of y'all know anything I'd appreciate it a ton

chaoticevil42 wrote:Hey guys, I've been working on the DSO list this year and I've got a clarification question. DSO vi. on the list is SN2014, but there are 136 CBAT supernovae using that designation. I think the rules intend SN2014J, which was the brightest supernova of the year, but it doesn't specify.

If any of y'all know anything I'd appreciate it a ton

I think it's supposed to be SN 2014J; "SN 2014" is a typo.

(usual disclaimer: this is not an official clarification)

Anyone found any actually useful Tully-Fisher equations (or other relationships that may be used for galactic computation)? I've been searching around for a few hours and have found a lot of relationships between variables but very few actually have 1. constants from observational correction or 2. input and output units for the variables, both of which are necessary to actually use an equation for a problem on a test. The closest that I've gotten with Tully-Fisher specifically is a set of equations relating absolute magnitude of a spiral galaxy in different bands to rotational velocity with correctional coefficients and constants, but these equations don't give the units of either variable. Though, I haven't spent as much time searching for other equations based on relationships, I have run into the same problem several times. If anyone has any input, advice, or even an equation, that would be great! Thank you!

MAAAAC wrote:Anyone found any actually useful Tully-Fisher equations (or other relationships that may be used for galactic computation)? I've been searching around for a few hours and have found a lot of relationships between variables but very few actually have 1. constants from observational correction or 2. input and output units for the variables, both of which are necessary to actually use an equation for a problem on a test. The closest that I've gotten with Tully-Fisher specifically is a set of equations relating absolute magnitude of a spiral galaxy in different bands to rotational velocity with correctional coefficients and constants, but these equations don't give the units of either variable. Though, I haven't spent as much time searching for other equations based on relationships, I have run into the same problem several times. If anyone has any input, advice, or even an equation, that would be great! Thank you!

I thought exactly the same thing when I was writing a test earlier. I haven't found a calibrated formula so far.

Unome wrote:

MAAAAC wrote:Anyone found any actually useful Tully-Fisher equations (or other relationships that may be used for galactic computation)? I've been searching around for a few hours and have found a lot of relationships between variables but very few actually have 1. constants from observational correction or 2. input and output units for the variables, both of which are necessary to actually use an equation for a problem on a test. The closest that I've gotten with Tully-Fisher specifically is a set of equations relating absolute magnitude of a spiral galaxy in different bands to rotational velocity with correctional coefficients and constants, but these equations don't give the units of either variable. Though, I haven't spent as much time searching for other equations based on relationships, I have run into the same problem several times. If anyone has any input, advice, or even an equation, that would be great! Thank you!

I thought exactly the same thing when I was writing a test earlier. I haven't found a calibrated formula so far.

I have the same issue. The closest things I've found thus far is this: http://astrosun2.astro.cornell.edu/~mas ... ces/tf.htm, but it hasn't been super useful.
I haven't had time to do it yet, but I was planning on looking into calibrating it using the milky way, to at least get a rough idea.

Adi1008 wrote:

chaoticevil42 wrote:Hey guys, I've been working on the DSO list this year and I've got a clarification question. DSO vi. on the list is SN2014, but there are 136 CBAT supernovae using that designation. I think the rules intend SN2014J, which was the brightest supernova of the year, but it doesn't specify.

If any of y'all know anything I'd appreciate it a ton

I think it's supposed to be SN 2014J; "SN 2014" is a typo.

(usual disclaimer: this is not an official clarification)

I'm thinking (and hoping, since I've already done a bunch of work under that assumption) that's probably it. I'll report it when the rules clarifications open up October 1st and we'll see for sure.

Sidebar: The DSOs this year are way cooler than they were last year.