A Spitzer/IRAC Census of the Asymptotic Giant Branch Populations in the Local Group Dwarf WLM

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

We present Spitzer/IRAC observations at 3.6 and 4.5 micron along with optical data from the Local Group Galaxies Survey to investigate the evolved stellar population of the Local Group dwarf irregular galaxy WLM. These observations provide a nearly complete census of the asymptotic giant branch (AGB) stars. We find that 39% of the infrared-detected AGB stars are not detected in the optical data, even though our 50% completeness limit is three magnitudes fainter than the tip of the red giant branch. An additional 4% of the infrared-detected AGB stars are misidentified as sub-TRGB red giants in the optical, presumably due to reddening by circumstellar dust. We also compare our results with those of a narrow-band optical carbon star survey of WLM and find the latter study sensitive to only 18% of the total AGB population. We detect objects with infrared fluxes consistent with them being mass-losing AGB stars, and we derive a present-day total mass-loss rate from the AGB stars of dot{M} = 0.7-2.4×10-3 M&sun; yr-1. The distributions of mass-loss rates and bolometric luminosities of AGB stars and red supergiants are very similar to those in the LMC and SMC, and the empirical maximum mass-loss rate observed in the LMC and SMC is in excellent agreement with our WLM data.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

A Spitzer/IRAC Census of the Asymptotic Giant Branch Populations in the Local Group Dwarf WLM 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 A Spitzer/IRAC Census of the Asymptotic Giant Branch Populations in the Local Group Dwarf WLM, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Spitzer/IRAC Census of the Asymptotic Giant Branch Populations in the Local Group Dwarf WLM will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-736053

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.