2015A&A...581A..81C


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.06CEST16:33:40

2015A&A...581A..81C - Astronomy and Astrophysics, volume 581A, 81-81 (2015/9-1)

B fields in OB stars (BOB). Detection of a strong magnetic field in the O9.7 V star HD 54879.

CASTRO N., FOSSATI L., HUBRIG S., SIMON-DIAZ S., SCHOELLER M., ILYIN I., CARROL T.A., LANGER N., MOREL T., SCHNEIDER F.R.N., PRZYBILLA N., HERRERO A., DE KOTER A., OSKINOVA L.M., REISENEGGER A., SANA H. (The BOB Collaboration)

Abstract (from CDS):

The number of magnetic stars detected among massive stars is small; nevertheless, the role played by the magnetic field in stellar evolution cannot be disregarded. Links between line profile variability, enhancements/depletions of surface chemical abundances, and magnetic fields have been identified for low-mass B-stars, but for the O-type domain this is almost unexplored. Based on FORS2 and HARPS spectropolarimetric data, we present the first detection of a magnetic field in HD54879, a single slowly rotating O9.7 V star. Using two independent and different techniques we obtained the firm detection of a surface average longitudinal magnetic field with a maximum amplitude of about 600G, in modulus. A quantitative spectroscopic analysis of the star with the stellar atmosphere code fastwind results in an effective temperature and a surface gravity of 33000±1000K and 4.0±0.1dex. The abundances of carbon, nitrogen, oxygen, silicon, and magnesium are found to be slightly lower than solar, but compatible within the errors. We investigate line-profile variability in HD54879 by complementing our spectra with spectroscopic data from other recent OB-star surveys. The photospheric lines remain constant in shape between 2009 and 2014, although Hα shows a variable emission. The Hα emission is too strong for a standard O9.7 V and is probably linked to the magnetic field and the presence of circumstellar material. Its normal chemical composition and the absence of photospheric line profile variations make HD54879 the most strongly magnetic, non-variable single O-star detected to date.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: evolution - stars: magnetic field - stars: massive - stars: individual: HD 54879

Status at CDS:  

Simbad objects: 10

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Number of rows : 10

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 * ups Ori V* 05 31 55.8601879 -07 18 05.537157 3.30 4.36 4.63 4.75 5.01 O9.7V 378 0
2 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1267 1
3 * zet Ori A ** 05 40 45.527 -01 56 33.26 0.50 1.77 1.88 1.84 2.04 O9.2IbvarNwk 642 0
4 HD 47129 SB* 06 37 24.0417003671 +06 08 07.376246443 5.23 6.11 6.06     O8I+O7.5III 367 0
5 NAME CMa OB1 As* 07 07.0 -10 28           ~ 122 0
6 HD 54879 * 07 10 08.1488998239 -11 48 09.835011060 6.8 7.60 7.65     O9.7V 63 0
7 HD 57682 * 07 22 02.0544956184 -08 58 45.761168747 5.20 6.24 6.43     O9.2IV 232 0
8 CPD-59 2629 * 10 45 08.2353841063 -59 46 06.975974457 10.780 11.336 10.848   9.971 O8.5Vp 57 0
9 M 20 OpC 18 02 42 -22 58.3           ~ 390 1
10 GSC 03157-00872 * 20 33 13.6906419627 +41 13 05.768523185 15.27 14.73 12.92     O8V 26 0

    Equat.    Gal    SGal    Ecl

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2020.04.06-16:33:40

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