2020A&A...639L...4C


Query : 2020A&A...639L...4C

2020A&A...639L...4C - Astronomy and Astrophysics, volume 639, L4-4 (2020/7-1)

V363 Cassiopeiae: a new lithium-rich Galactic Cepheid.

CATANZARO G., RIPEPI V., CLEMENTINI G., CUSANO F., DE SOMMA G., LECCIA S., MARCONI M., MOLINARO R., MORETTI M.I., MUSELLA I. and TESTA V.

Abstract (from CDS):


Context. Classical Cepheids (DCEPs) are important astrophysical objects not only as standard candles in the determination of the cosmic distance ladder, but also as a testbed for the stellar evolution theory. This is based on the strict connection between their pulsation (period(s) and amplitudes) and stellar parameters (luminosity, mass, effective temperature, and metallicity).
Aims. We examine the nature of the Galactic DCEP V363 Cas and other DCEPs that show cosmic abundances of lithium in their atmospheres.
Methods. We collected three epochs of high-resolution spectroscopy for V363 Cas with HARPS-N at the TNG. We measured accurate stellar parameters: the effective temperatures, gravities, microturbulences, radial velocities, and metal abundances.
Results. We detected a lithium abundance of A(Li)=2.86±0.10dex, along with iron, carbon, and oxygen abundances of [Fe/H]=-0.30±0.12dex, [C/H]=-0.06±0.15dex, and [O/H]=0.00±0.12dex. V363 Cas is the fifth of the Milky Way DCEPs to exhibit a Li-rich feature. An analysis of historical time-series spanning a 100-year interval shows that the period of V363 Cas is increasing, with a sharp acceleration after HJD=2453000 days. This is a clear indication of a first crossing of the instability strip.
Conclusions. Our results favour the scenario in which the five Galactic Li-rich DCEPs are on their first crossing of the instability strip and have had slowly rotating progenitors during their main-sequence phase.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: variables: Cepheids - pulsars: individual: V363 Cas - stars: abundances - stars: fundamental parameters - Hertzsprung-Russell and C-M diagrams - stars: evolution

Simbad objects: 7

goto Full paper

goto View the references in ADS

Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* V363 Cas cC* 00 15 14.3334878928 +60 20 25.690341840   11.26 10.68     kF6hF7 50 0
2 V* V371 Per cC* 02 55 31.1849232456 +42 35 19.729034664   11.52 10.95     ~ 19 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16158 1
4 ASAS J075842-2536.1 EB? 07 58 42.1652621746 -25 36 00.940024089   12.888 12.239 12.192   ~ 4 0
5 V* V356 Mus cC* 13 17 13.7705158896 -66 04 59.486705868   11.6 11.50 11.59 11.05 ~ 7 0
6 V* V1033 Cyg cC* 20 05 20.6650542528 +32 39 32.806824120     12.60 12.59   ~ 38 0
7 NAME Local Group GrG ~ ~           ~ 7723 0

To bookmark this query, right click on this link: simbad:objects in 2020A&A...639L...4C and select 'bookmark this link' or equivalent in the popup menu


2022.08.13-02:19:40

© Université de Strasbourg/CNRS

    • Contact