SIMBAD references

2001A&A...367..831U - Astronomy and Astrophysics, volume 367, 831-839 (2001/3-1)

Spectroscopic investigations of classical cepheids and main-sequence stars in galactic open clusters and associations. I. Association Cas OB2 and the small-amplitude cepheid SU Cassiopeae.


Abstract (from CDS):

The small-amplitude Cepheid SU Cas and four members of the association Cas OB2 (HD 16893, HD 17327a and b, HD 17443) were investigated, using high-resolution CCD spectra. The following results were obtained: 1) All these objects have the same metallicity values, close to that of the Sun; 2) Elemental abundance indicates that SU Cas is a post first dredge-up star with an age from 1x108 to 1.45x108yr, and it is not crossing the Cepheid instability strip for the first time. The mean value of logg=2.35 corresponds to pulsations in the fundamental tone, although errors in gravity estimations provide overtone pulsations. The questions about its pulsational mode and membership in Cas OB2 remained open; 3) HD 17327a is a slowly rotating HgMn-star with the highest helium content among such objects, while HD 16893 also has a manganese overabundance and might be classified as an Am-star; 4) HD 17327b and HD 17443 are rapidly rotating main-sequence stars, while HD 17443 has a helium content comparable with that of the Sun.

Abstract Copyright:

Journal keyword(s): associations - stars: abundances - stars: Cepheids - stars: main-sequence

CDS comments: Table 1: objects Sco OBa, and OBanon, not identified

Simbad objects: 77

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