Abundance analysis of roAp stars. V. HD 166473

Details Abundance analysis of roAp stars. V. HD 166473 Abundance analysis of roAp stars. V. HD 166473

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...356..200g&link_type=abstract

Astronomy and Astrophysics, v.356, p.200-208 (2000)

Astronomy and Astrophysics

Astrophysics

35

Stars: Abundances, Stars: Atmospheres, Stars: Chemically Peculiar, Stars: Fundamental Parameters, Stars: Individual: Hd166473

Scientific paper

This fifth paper in a sequence on abundance analyses of roAp stars features several improvements and complements over the previous investigations: i. The new VALD-2 atomic data base was used which significantly improves the analysis of C, N, O, and rare earth elements (REE) and in particular includes also some doubly ionized REE species. ii. An individual opacity distribution function table was generated for a successful synthesis of photometric indices of this very peculiar star. iii. The influence of a (rather strong) magnetic field on abundance determinations is studied and presented for 30 elements. iv. Our investigation of 33 elements (45 ions) is the hitherto most complete chemical analysis of a chemically peculiar star, using modern tools. Similar to the four roAp stars analysed by us so far (alpha Cir: Kupka et al. 1996, HD 203932: Gelbmann et al. 1997, gamma Equ: Ryabchikova et al. 1997a, and HD 24712: Ryabchikova et al. 1997b) we find nearly solar abundances of Fe and Ni, and a definite overabundance of Cr and especially Co. Rare earth elements have large overabundances, whereas C and O are underabundant relative to the Sun. This pattern seems to be a common property of the chemically peculiar (CP2, Ap) stars. A new and most striking result is the discovery of the anomalous line strengths of the second ions of REE resulting in an abundance increase of up to +1.5 dex, compared to values obtained from lines of the first ions. This anomaly is not found in non-roAp and ``normal'' stars. Based on observations obtained at the European Southern Observatory (La Silla, Chile)

Affiliated with

Also associated with

No associations

Rating

Abundance analysis of roAp stars. V. HD 166473 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 Abundance analysis of roAp stars. V. HD 166473, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Abundance analysis of roAp stars. V. HD 166473 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-747774