Carina Nebula

Astronomy 61: Current Problems in Astronomy and Astrophysics

Prof. David Cohen

Spring 2015
Friday 11:30 to 12:20
SC 113 (seminar room)


Townsley image windtabs transmission windtabs fit HD93129





posted 1/24

Our main reading for this week is posted below. A few more things (data related, but also responses to your second round of Carina questions from last week) will be posted over the next few days.

Archive of old announcements.



posted 1/27

The Moodle forum is open – you should post your question(s) about this week's paper there.

posted 1/24

For this week we will read and discuss Cohen et al., "Chandra X-ray spectroscopy of the very early O supergiant HD 93129A: constraints on wind shocks and the mass-loss rate," Monthly Notices of the Royal Astronomical Society, 415, 3354 (2011). Each student will post a question on the Moodle forum (not yet opened up) by Wednesday night. This paper analyzes the X-ray spectrum of the earliest type (hottest, bluest) O star in the Carina nebula in two different ways in order to measure the wind mass-loss rate (and derive information about the temperature distribution of the shock-heated, X-ray emitting plasma). The second one, applied to the low-resolution "zeroth order spectrum" is the technique we'll be applying to similar data from other O stars in the cluster.

Archive of old assignments.



Class information

Class Moodle page

class information (posted before the semester)


Useful resources

Local computing information

ADS: for papers
astro-ph: for more papers
SIMBAD: for objects
Astronomical Catalogs: for catalogs

X-ray astronomy

Chandra X-ray Center
XSPEC manual: spectral fitting

General astro research information

Astrobetter – lots of useful information about the nitty-gritty of astronomical research and many aspects of being an astronomy student and astronomer

Astrobites – very short summaries of interesting research papers, written for undergraduates by graduate students.




This page is maintained by David Cohen
cohen -at-

Last modified: January 27, 2015