ar X iv : a st ro - p h / 98 05 05 8 v 1 6 M ay 1 99 8 The effects of convection on the colours of A and F stars

نویسندگان

  • B. Smalley
  • F. Kupka
چکیده

We present a discussion on the effects of convection on the uvby colours of A and F stars. The mixing-length theory used in ATLAS9 is compared to the turbulent convection theory of Canuto & Mazzitelli (1991, 1992). Comparison with fundamental stars reveals that colours calculated using the Canuto & Mazzitelli convection theory are generally in better agreement than those obtained using mixing-length theory.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

ar X iv : a st ro - p h / 98 05 05 1 v 1 6 M ay 1 99 8 The λ Bootis stars

In this article the current knowledge of the group of λ Bootis stars is reviewed. These metal poor objects are quite outstanding compared to other chemically peculiar stars of the upper main sequence. Up to now no theory has been developed which is able to explain the majority of observational results. This article is mainly focused on the work which needs to be done in the future in order to c...

متن کامل

ar X iv : a st ro - p h / 98 05 21 3 v 1 1 5 M ay 1 99 8 Light element abundances in He - rich stars

We present an abundance analysis of light elements in He-rich stars. The analysis is based on both low and high resolution observations collected at ESO, La Silla, Chile in the optical region and includes 6 standards and 21 He-rich stars. Light-element abundances display a diverse pattern: they range from under-solar up to above-solar values.

متن کامل

ar X iv : a st ro - p h / 98 05 18 9 v 1 1 4 M ay 1 99 8 Isotopic composition of Hg and Pt in slowly rotating HgMn stars

Preliminary results from a study of the isotopic compositions of the elements Hg and Pt in a number of HgMn stars are presented. This work represents an improvement over previous studies thanks to the very high spectral resolution available (R = 118 000) and to the new information on wavelengths and atomic structure of Hg II and Pt II.

متن کامل

ar X iv : a st ro - p h / 98 05 06 4 v 1 6 M ay 1 99 8 Mercury and platinum abundances in mercury - manganese stars

We report new results for the elemental and isotopic abundances of the normally rare elements mercury and platinum in HgMn stars. Typical overabundances can be 4 dex or more. The isotopic patterns do not follow the fractionation model of White et al (1976).

متن کامل

ar X iv : a st ro - p h / 98 05 07 5 v 1 6 M ay 1 99 8 The evolutionary state and fundamental parameters of metallic A - F giants

Using Hipparcos parallaxes, we show that the metallic A-F giants found by Hauck (1986) on the basis of their high ∆m2 index in Geneva photom-etry are on average more evolved than their non-metallic counterparts. Their mass distribution, rate of binaries and v sin i are shown to be incompatible with those of Am stars, so that they cannot be descendants of the latter. They might be former normal ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1998