Separating M33 Red Giant Stars From Foreground Milky Way Dwarfs

Details Separating M33 Red Giant Stars From Foreground Milky Way Dwarfs Separating M33 Red Giant Stars From Foreground Milky Way Dwarfs

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514103t&link_type=abstract

American Astronomical Society Meeting 205, #141.03; Bulletin of the American Astronomical Society, Vol. 36, p.1579

Astronomy and Astrophysics

Astronomy

Scientific paper

Our goal is to quantify the kinematics and chemical abundances of the stellar populations (thin disk and thick disk and/or halo) of the nearby spiral galaxy M33 in order to test sophisticated models of galaxy formation. We are using the DEIMOS spectrograph at the Keck II 10-meter telescope to obtain spectra surrounding the Ca II near-infrared triplet lines for approximately 1000 red giant stars throughout M33's disk and halo. From the spectra we will measure the radial velocities and chemical abundances of the stars and distinguish the separate stellar populations. One critical step in our project is our use of V, I, and DDO51-band imaging to separate M33 red giants from foreground Milky Way dwarf stars, because the radial velocities of these stars overlap significantly. Our imaging has been done using the Kitt Peak National Observatory 4-meter telescope and MOSAIC camera. A star's flux in the DDO51 filter (centered at 5100 Å; width of 150 Å) is a measure of the strength of the Mg I lines that are highly dependent on the star's surface gravity. Thus when plotted in a (V-I) vs. (DDO51-V) diagram, most M33 red giants are easily discriminated from foreground Galactic dwarfs. We will present photometric results from a field located SE of M33's core along the minor axis, the first of four fields that we have observed. We also will show fiducials from globular and open star clusters that illustrate this technique's lack of metallicity dependence, and thus its power.
We gratefully acknowledge financial support from grants NSF AST-0307863 and STScI/NASA GO-9837 to Tammy Smecker-Hane.

Affiliated with

Also associated with

No associations

Rating

Separating M33 Red Giant Stars From Foreground Milky Way Dwarfs 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 Separating M33 Red Giant Stars From Foreground Milky Way Dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Separating M33 Red Giant Stars From Foreground Milky Way Dwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1643572