2006A&A...450..873M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST17:40:43

2006A&A...450..873M - Astronomy and Astrophysics, volume 450, 873-880 (2006/5-1)

The Araucaria project. Bright variable stars in NGC6822 from a wide-field imaging survey.

MENNICKENT R.E., GIEREN W., SOSZYNSKI I. and PIETRZYNSKI G.

Abstract (from CDS):

We have performed a search for variable stars in the dwarf irregular galaxy NGC6822 using wide-field multi-epoch VI photometry down to a limiting magnitude V ∼22. Apart from the Cepheid variables in this galaxy already reported in an earlier paper by Pietrzynski et al. (2004AJ....128.2815P), we have found 1019 ``non-periodic'' variable stars, 50 periodically variable stars with periods ranging from 0.12 to 66-days and 146 probably periodic variables. Twelve of these stars are eclipsing binaries and fifteen are likely new, low-amplitude Cepheids. Interestingly, seven of these Cepheid candidates have periods longer than 100-days, have very low amplitudes (less than 0.2mag in I), and are very red. They could be young, massive Cepheids still embedded in dusty envelopes. The other objects span a huge range in colours and represent a mixture of different types of luminous variables. Many of the variables classified as non-periodic in the present study may turn out to be periodic variables once a much longer time baseline will be available to study them. We provide the catalogue of photometric parameters and show the atlas of light curves for the new variable stars. Our present catalogue is complementary to the one of Baldacci et al. (2005A&A...431.1189B) which has focussed on very short-period and fainter variables in a subfield in NGC 6822.

Abstract Copyright:

Journal keyword(s): galaxies: stellar content - binaries: eclipsing - stars: variables: general - Cepheids - Local Group - binaries: general

VizieR on-line data: <Available at CDS (J/A+A/450/873): table1.dat table2.dat table3.dat tables.tex>

Nomenclature: Tables 1, 2, 3: [MGS2006] NNNNN-N N=50+146+1019.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 8

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Number of rows : 8

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 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1328 2
2 [LDB2002] 401 V* 19 44 53.811 -14 46 59.92           ~ 4 0
3 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1443 0
4 [AFM2002b] V0130 V* 19 44 58.73 -14 49 55.7           ~ 2 0
5 [AFM2002b] V2881 V* 19 44 58.84 -14 47 26.6           ~ 2 0
6 [BRC2005] V112 V* 19 44 59.41 -14 47 16.2   22.299 21.584     ~ 2 0
7 [BRC2005] V215 V* 19 45 25.27 -14 45 50.7   23.467 22.663     ~ 2 0
8 NAME Local Group GrG ~ ~           ~ 7074 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-17:40:43

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