J/MNRAS/482/5567 Stellar variability in Galactic Centre (Navarro Molina+, 2019)
Long-term stellar variability in the Galactic Centre region.
Navarro Molina C., Borissova J., Catelan M., Lucas P.W., Medina N.,
Contreras Pena C., Kurtev R., Minniti D.
<Mon. Not. R. Astron. Soc., 482, 5567-5586 (2019)>
=2019MNRAS.482.5567N 2019MNRAS.482.5567N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Stars, variable ; Galactic center ; Magnitudes
Keywords: stars: AGB and post-AGB, cataclysmic variables, protostars -
stars: variables: general - Galaxy: centre - Galaxy: stellar content
Abstract:
We report the detection of variable stars within a
11.5arcminx11.5arcmin region near the Galactic Centre that includes
the Arches and Quintuplet clusters, as revealed by the VISTA Variables
in the Via Lactea survey. There are 353 sources that show KS-band
variability, of which the large majority (81 per cent) correspond to
red giant stars, mostly in the asymptotic giant branch phase. We
analyse a population of 52 red giants with long-term trends that
cannot be classified into the typical pulsating star categories.
Distances and extinctions are calculated for nine Mira variables, and
we discuss the impact of the chosen extinction law on the derived
distances. We also report the presence of 48 new identified young
stellar object candidates in the region.
Description:
Data for this work were obtained from the VVV survey. Images were
taken with the VISTA InfraRed CAMera (VIRCAM) at the Visible and
Infrared Survey Telescope for Astronomy (VISTA) 4.1m telescope,
located in Cerro Paranal, Chile. This survey comprises KS images of
the Galactic Bulge and part of the disc, acquired between 2010 August
and 2015 September, in addition to two single and nearly simultaneous
ZYJH observations, taken during the first and last years of the
project.
Furthermore, we cross-matched our variable stars with the point-source
catalogue of Ramirez et al. (2008ApJS..175..147R 2008ApJS..175..147R, Cat.
J/ApJS/175/147). The authors used the Spitzer Space Telescope,
equipped with the Infrared Array Camera (IRAC), to survey the inner
2.0°x1.4° region of the GC. The array has four channels,
equivalent to the [3.6], [4.5], [5.8], and [8.0] µm bands. All of
our variable stars were matched with their closest counterpart from
the Ramirez et al. sources, within 1arcsec. There are 182 stars with
at least one mid-IR measurement in the Ramirez et al. catalogue.
The full summary with the main properties of the 353 candidate
variable stars is presented in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 132 353 Main properties of the 353 candidate variable
stars
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Name asigned to each variable star (NVNNN)
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 17 F5.2 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 30 F5.2 arcsec DEs Declination (J2000)
32- 39 F8.6 deg GLON Galactic longitude
41- 49 F9.6 deg GLAT Galactic latitude
51- 55 F5.2 mag Jmag ? VVV J-band magnitude
57- 61 F5.2 mag Hmag ? VVV H-band magnitude
63- 67 F5.2 mag Ksmag ? VVV Ks-band magnitude
69- 73 F5.2 mag 3.6mag ? Spitzer/IRAC 3.6um band magnitude
75- 79 F5.2 mag 4.5mag ? Spitzer/IRAC 4.5um band magnitude
81- 85 F5.2 mag 5.8mag ? Spitzer/IRAC 5.8um band magnitude
87- 91 F5.2 mag 8.0mag ? Spitzer/IRAC 8.0um band magnitude
93- 97 F5.2 mag Ksmagmean Mean Ks magnitude, defined simply as the
mean value between the maximum and minimum
magnitudes for each star
99-102 F4.2 mag AmpKsmag Peak-to-trough amplitude of the variation
104-112 F9.4 d Period ? Period estimation with the generalized
Lomb-Scargle (GLS) periodogram
(Lomb 1976Ap&SS..39..447L 1976Ap&SS..39..447L;
Scargle 1982ApJ...263..835S 1982ApJ...263..835S;
Zechmeister & Kurster 2009A&A...496..577Z 2009A&A...496..577Z)
114-129 A16 --- Class Variability type
131-132 I2 --- r_Name ? Reference for the variables found in
previous works (1)
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Note (1): References as follows:
1 = Matsunaga et al. 2009MNRAS.399.1709M 2009MNRAS.399.1709M, Cat. J/MNRAS/399/1709
2 = Matsunaga et al. 2013MNRAS.429..385M 2013MNRAS.429..385M, Cat. J/MNRAS/429/385
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 01-Jul-2022