Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-16
Astrophys.J.690:1829-1838,2009
Astronomy and Astrophysics
Astrophysics
11 pages, 7 figures, prepared using emulateapj.cls, ApJ accepted
Scientific paper
10.1088/0004-637X/690/2/1829
It has been observed that Cepheids in the Magellanic Clouds have lower masses for the same luminosity than those in the Milky Way. The model, from Neilson & Lester (2008), of pulsation-driven mass loss for Cepheids is applied to theoretical models of Cepheids with metallicity consistent with the Milky Way and Large and Small Magellanic Clouds. The mass-loss model is analyzed using the metallicity correction of the Period-Luminosity relation to compare the ratio of mass loss of Cepheids with lower metallicity to that of Cepheids with solar metallicity. It is determined that mass loss may be larger for the lower metallicity Cepheids, counterintuitive to radiative driving estimates. Also the mass-loss rates of theoretical Cepheid models are found to be up to $5\times 10^{-9}$ for Galactic Cepheids, $5\times 10^{-8}$ for Large Magellanic Cloud Cepheids, and $2\times 10^{-7}M_\odot /yr$ for Small Magellanic Cloud Cepheids. It is argued that mass loss increases as metallicity decreases for Cepheids with periods less than 20 days and that mass loss decreases for longer periods. Assuming dust forms in the wind of a Cepheid at some distance, the infrared excess of the models is computed, finding the infrared brightness is approximately a magnitude larger due to mass loss. The infrared magnitudes are compared to recently published Period-Luminosity relations as a test of our predictions.
Lester John B.
Neilson Hilding R.
No associations
LandOfFree
On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation. II. The Effect of Metallicity 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 On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation. II. The Effect of Metallicity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation. II. The Effect of Metallicity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-660765