Chemical Abundances and Kinematics of the Stellar Populations of M33

Details Chemical Abundances and Kinematics of the Stellar Populations of M33 Chemical Abundances and Kinematics of the Stellar Populations of M33

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431404h&link_type=abstract

American Astronomical Society, AAS Meeting #214, #314.04; Bulletin of the American Astronomical Society, Vol. 41, p.759

Astronomy and Astrophysics

Astronomy

Scientific paper

We will present the results of a spectroscopic survey of red giant stars in the Local Group spiral galaxy M33, including evidence for the existence of a thick disk and stellar halo. Surface photometry of M33 is well-fit by a single exponential disk (Teig 2007), however, this does not exclude the existence of a thick disk with a similar scale length. Since M33's systemic velocity significantly overlaps the velocities of Milky Way dwarfs, radial velocity measurements are not sufficient to separate foreground dwarfs from bona fide M33 stars. Instead, we used our photometric observations in V, I, and the narrow-band DDO51 filters to identify M33 stars. We use the DEIMOS multi-object spectrograph on the Keck 10-meter telescope to obtain spectra surrounding the CaII triplet of absorption lines. We have analyzed the radial velocities of 443 confirmed M33 red giant stars from 7 fields along the major and minor axes of the galaxy. In addition to a stellar thin disk with a velocity dispersion of 24 km/s, we detect a population of stars along the major axis that are shifted toward M33's systemic velocity. These stars represent a stellar thick disk, rotating slower than the HI gas. We also find 11 stars with velocities very different from the rotating disk that are members of a stellar halo. This halo makes up 8% of the stars in our fields, with a velocity dispersion of 54 km/s. In addition to these kinematic measurements, we will also present chemical abundance information for individual red giant stars throughout M33.

Affiliated with

Also associated with

No associations

Rating

Chemical Abundances and Kinematics of the Stellar Populations of M33 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Chemical Abundances and Kinematics of the Stellar Populations of M33, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical Abundances and Kinematics of the Stellar Populations of M33 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1106372