2014A&A...563A..48N


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:21:56

2014A&A...563A..48N - Astronomy and Astrophysics, volume 563A, 48-48 (2014/3-1)

Revisiting the fundamental properties of the Cepheid Polaris using detailed stellar evolution models.

NEILSON H.R.

Abstract (from CDS):

Polaris the Cepheid has been observed for centuries, presenting surprises and changing our view of Cepheids and stellar astrophysics, in general. Specifically, understanding Polaris helps anchor the Cepheid Leavitt law, but the distance must be measured precisely. The recent debate regarding the distance to Polaris has raised questions about its role in calibrating the Leavitt law and even its evolutionary status. In this work, I present new stellar evolution models of Cepheids to compare with previously measured CNO abundances, period change and angular diameter. Based on the comparison, I show that Polaris cannot be evolving along the first crossing of the Cepheid instability strip and cannot have evolved from a rapidly-rotating main sequence star. As such, Polaris must also be at least 118 pc away and pulsates in the first overtone, disagreeing with the recent results of Turner et al. (2013ApJ...762L...8T).

Abstract Copyright:

Journal keyword(s): stars: distances - stars: fundamental parameters - stars: evolution - stars: mass-loss - stars: individual: Polaris - stars: variables: Cepheids

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf UMi cC* 02 31 49.09456 +89 15 50.7923 3.00 2.62 2.02 1.53 1.22 F8Ib 609 2
2 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 797 2
3 OGLE LMC-CEP-227 cC* 04 52 15.6982549282 -70 14 31.242341027     15.317   14.438 ~ 47 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
5 V* GU Nor cC* 16 14 54.7527637745 -53 20 18.342856523   11.60 10.08   8.802 ~ 78 0
6 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 676 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:21:56

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