Spectrum of the star BD -00o3227 provided by S. Howell (National Optical Astronomy Observatories)

PHYS 6980/8980 Special Topics (Stellar Spectra)


Latest update to this page: 4/29/06 10:45


For additional information, students registered for this course should visit the My Consolidated Courses channel in the MyUT portal.

Backup copies of documents (PDF unless otherwise noted) Links to on-line materials shown in class

Links related to the term project


Materials shown in class, most recent first

Friday, April 28:

Wednesday, April 26:

Monday, April 24: Example infrared spectral energy distributions from young stellar objects: Figures 3e, 3c, and 3a from Wilking, B. A., Lada, C. J., and Young, E T. 1989, Astrophys. J., 340, 823

Friday, April 21

Monday, April 10: Here is an authoritative guide to constellation names and how they are used (possessive form) with star names. No pronunciation guide, though.

Friday, April 7: M star frames from A Digital Spectral Classification Atlas by R. O. Gray, nos. 24, 25, and 26.

Friday, March 31

Wednesday, March 29

Monday, March 27

Friday, March 24

Wednesday, March 22

Monday, March 20

Friday, March 17

Wednesday, March 15

Monday, March 13

As usual, electronic copies of the displayed materials are in the Photos section of the consolidated course page in MyUT. Sources:

Friday, March 3

As usual, electronic copies of the handouts are in the Photos section of the consolidated course page in MyUT. Sources:

Wednesday, March 1

Sources used

Monday, February 27

Handouts, along with the spectrum not included in the handouts, are in Photos section of consolidated course page, MyUT. Sources:

Friday, February 24

Handouts are in Photos section of consolidated course page, MyUT Wednesday, February 22: Partial Grotrian diagram of He I, photo available on the MyUT Consolidated Course page

Monday, February 13, and Wednesday, February 15

Friday, February 10, new items:

Wednesday, February 8:

Energy distributions of two stars from Jacoby et al. (see citation below) with sensitivity functions of uvby filters from Matsushima 1969, ApJ, 158, 1137 (right click for larger version)
Figure 7a and Figure 8a (handout only, to be shown next time) from Lester, J. B., Gray, R. O., and Kurucz, R.l. 1986, ApJS, 61, 509

Monday, February 6:

Monday, January 30: As examples of stellar spectral energy distributions, Fig. 1 from Code, Davis, Bless, and Hanbury Brown 1976, ApJ, 203, 417

Friday, January 27

Wednesday, January 25

Graph of the rotational broadening line profile function for a uniformly bright, spherical, rigidly rotating star.

Comparison between the Hα profiles of two A0V stars: the sharp-lined, apparently slowly rotating star α Lyrae (Vega); and the rapidly rotating star ζ Aquilae. The SIMBAD database gives several measured values for the latter star, all near 300 km s-1

Friday, January 20 - right click image (control click on the Mac) to view at full size

Comparison of two spectra of the same star (ο Aquilae, F8V) at very different spectral resolutions. The spectrum plotted in white was taken with the Ritter Low-Dispersion Spectrograph at a resolving power λ/Δ&lambda = 6,000; the one in red was taken with ELODIE at the Observatoire de Haute-Provence (France) at a resolving power of 42,000.

Procedure for estimation of signal-to-noise ratio in a spectrum of Deneb (α Cygni, A2Ia) taken with the Ritter échelle spectrograph. This screen was entered from splot by means of the f keystroke.

Now that I look at it again, the line representing the fit to the continuum is too low in the right-hand half of the spectrum. It should go through the middle of the noise fluctuations. For this reason, the calculated rms may be too large.

Wednesday, January 18


Instructor: Nancy D. Morrison