2005A&A...438..265L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:57:25

2005A&A...438..265L - Astronomy and Astrophysics, volume 438, 265-271 (2005/7-4)

A Be star with a low nitrogen abundance in the SMC cluster NGC 330.

LENNON D.J., LEE J.-K., DUFTON P.L. and RYANS R.S.I.

Abstract (from CDS):

High-resolution UVES/VLT spectra of B12, an extreme pole-on Be star in the SMC cluster NGC 330, have been analysed using non-LTE model atmospheres to obtain its chemical composition relative to the SMC standard star AV 304. We find a general underabundance of metals which can be understood in terms of an extra contribution to the stellar continuum due to emission from a disk which we estimate to be at the ∼25% level. When this is corrected for, the nitrogen abundance for B12 shows no evidence of enhancement by rotational mixing as has been found in other non-Be B-type stars in NGC 330, and is inconsistent with evolutionary models which include the effects of rotational mixing. A second Be star, NGC 330-B17, is also shown to have no detectable nitrogen lines. Possible explanations for the lack of rotational mixing in these rapidly rotating stars are discussed, one promising solution being the possibility that magnetic fields might inhibit rotational mixing.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: early-type - stars: emission-line, Be - galaxies: individual: Small Magellanic Cloud

Simbad objects: 11

goto Full paper

goto View the reference in ADS

Number of rows : 11

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
2 Cl* NGC 330 ARP 5 * 00 56 10.65 -72 28 10.1 13.94 14.74 14.85   15.08 B2II 18 0
3 Cl* NGC 330 ARP 44 Be* 00 56 12.1318089637 -72 27 17.074890625 14.24 15.15 15.21   15.18 B2III 15 0
4 NGC 330 Cl* 00 56 20.59 -72 27 12.5 9.37 9.76 9.55   8.89 ~ 366 0
5 Cl* NGC 330 ARP 27 Be* 00 56 25.4613893470 -72 27 07.168250688 14.38 15.32 15.36   15.34 B2III 21 0
6 Cl* NGC 330 ROB B4 * 00 56 30.9107033196 -72 28 19.266766341   15.41 15.58   15.769 B1.5IVe 12 0
7 AzV 304 * 01 02 21.4818321206 -72 39 14.588838933   14.66 14.77     B0.5V 46 0
8 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 901 0
9 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1271 1
10 * ome Ori Be* 05 39 11.1463172 +04 07 17.279475 3.73 4.48 4.59 4.57 4.67 B3Ve 388 1
11 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 683 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2005A&A...438..265L and select 'bookmark this link' or equivalent in the popup menu


2020.07.04-21:57:25

© Université de Strasbourg/CNRS

    • Contact