CLASSICAL CEPHEIDS REQUIRE ENHANCED MASS LOSS
نویسندگان
چکیده
منابع مشابه
The Connection Between Pulsation, Mass Loss and Circumstellar Shells in Classical Cepheids
Recent observations of Cepheids using infrared interferometry and Spitzer photometry have detected the presence of circumstellar envelopes (CSE) of dust and it has been hypothesized that the CSE’s are due to dust forming in a Cepheid wind. Here we use a modified Castor, Abbott & Klein formalism to produce a Cepheid wind, and this is used to estimate the contribution of mass loss to the Cepheid ...
متن کاملConstraining the thin disc initial mass function using Galactic classical Cepheids
Context. The initial mass function (IMF) plays a crucial role in galaxy evolution and its implications on star formation theory make it a milestone for the next decade. It is in the intermediate and high mass ranges where the uncertainties of the IMF are larger. This is a major subject of debate and analysis both for Galactic and extragalactic science. Aims. Our goal is to constrain the IMF of ...
متن کاملNew period - luminosity and period - color relations of classical Cepheids III . Cepheids in SMC
The photometric data for 460 classical, fundamental-mode Cepheids in the SMC with log P > 0.4 measured by Udalski et al. have been analyzed for their period-color (P-C) and period-luminosity (P-L) relations, and for the variation of amplitude across the instability strip in a similar way that was done in Papers I and II of this series. The SMC Cepheids are bluer in (B−V) 0 at a given period tha...
متن کاملPeriod Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids
We compared period changes derived from O − C diagrams for 63 classical Cepheids from our Galaxy with model calculations. We found that for Cepheids with log P > 1.0 the observed changes are smaller than predicted values, except variable SZ Cas. However some of the first overtone Cepheids, particularly EU Tau and Polaris, change its period much faster than it follows from theory. Summary of the...
متن کاملOn the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation
An analytical derivation is presented for computing mass–loss rates of Cepheids by using the method of Castor et al. (1975) modified to include a term for momentum input from pulsation and shocks generated in the atmosphere. Using this derivation, mass–loss rates of Cepheids are determined as a function of stellar parameters. When applied to a set of known Cepheids, the calculated mass–loss rat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 2041-8205,2041-8213
DOI: 10.1088/2041-8205/760/1/l18