J/MNRAS/453/133 WISE view of RV Tauri stars (Gezer+, 2015)
The WISE view of RV Tauri stars.
Gezer I., Van Winckel H., Bozkurt Z., De Smedt K., Kamath D., Hillen M.,
Manick R.
<Mon. Not. R. Astron. Soc. 453, 133 (2015)>
=2015MNRAS.453..133G 2015MNRAS.453..133G
ADC_Keywords: Stars, variable ; Stars, population II ; Photometry, infrared
Keywords: stars: AGB and Post-AGB - circumstellar matter -
stars: variables: Cepheids - infrared: stars
Abstract:
We present a detailed study based on infrared (IR) photometry of all
Galactic RV Tauri stars from the General Catalogue of Variable Stars
(GCVS). RV Tauri stars are the brightest among the Population II
Cepheids. They are thought to evolve away from the asymptotic giant
branch (AGB) towards the white dwarf domain. IRAS detected several RV
Tauri stars because of their large IR excesses and it was found that
they occupy a specific region in the [12]-[25], [25]-[60] IRAS
two-colour diagram. We used the all sky survey of Wide-field Infrared
Survey Explorer to extend these studies and compare the IR properties
of all RV Tauri stars in the GCVS with a selected sample of post-AGB
objects with the goal to place the RV Tauri pulsators in the context
of post-AGB evolution. Moreover, we correlated the IR properties of
both the RV Tauri stars and the comparison sample with other
observables like binarity and the presence of a photospheric chemical
anomaly called depletion. We find that Galactic RV Tauri stars display
a range of IR properties and we differentiate between disc sources,
objects with no IR excess and objects for which the spectral energy
distribution (SED) is uncertain. We obtain a clear correlation between
disc sources and binarity. RV Tauri stars with a variable mean
magnitude are exclusively found among the disc sources. We also find
evidence for disc evolution among the binaries. Furthermore our
studies show that the presence of a disc seems to be a necessary but
not sufficient condition for the depletion process to become
efficient.
Description:
We have searched for Galactic RV Tauri stars from the General
Catalogue of Variable Stars (GCVS). We used the all sky survey of WISE
and full SED analysis to understand RV Tauri nature. We classified RV
Tauri stars according to their positions in the WISE colour-colour
diagram and SED types. We found that 153 Galactic RV Tauri variables
exist in the GCVS. However, 25 of the 153 RV Tauri stars are probably
misclassified objects because of their period range and spectral
types. Remaining 128 RV Tauri stars are divided 3 groups with respect
to our study. 29 of them are disc sources, 63 of them are non-IR
sources and 34 of them have an unclear SED.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rvtau.dat 87 171 List of Galactic RV Tauri stars (table2)
table1.dat 87 60 Reference sample, consisting of well-selected and
observationally characterized post-AGB objects
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
II/328 : AllWISE Data Release (Cutri+ 2013)
Byte-by-byte Description of file: rvtau.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Star name
24- 26 A3 --- n_Name [* ] Note on Name (1)
28- 37 F10.6 deg RAdeg Right ascension (J2000)
39- 48 F10.6 deg DEdeg Declination (J2000)
50- 59 A10 --- SpType MK spectral type
61- 66 F6.3 mag W3-W4 WISE colour W3-W4
68- 73 F6.3 mag W1-W2 WISE colour W1-W2
75- 87 A13 --- SED SED comments (2)
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Note (1): Notes as follows:
* = not Galactic but members of the Large or Small Magellanic Cloud
** = Disc nature has already been given by de Ruyter et al.
(2006A&A...448..641D 2006A&A...448..641D)
*** = WISE data indicates saturation
Note (2): SED comments as follows:
disc = disc sources
non-IR = non-IR sources
uncertain = sources with unclear SED
misclassified = probably misclassified RV Tauri 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- 11 A11 --- IRAS IRAS name (HHMMm+DDMM)
12- 13 A2 --- n_IRAS [* ] Note (1)
15- 24 A10 --- Name Other name
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 36 F5.2 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 49 F5.2 arcsec DEs Declination (J2000)
51- 62 A12 --- SpType MK spectral type
64- 68 F5.3 mag W3-W4 ?=- WISE colour W3-W4
70- 75 F6.3 mag W1-W2 ?=- WISE colour W1-W2
77- 81 A5 --- SED SED comments: disc or shell
83- 87 A5 --- Ref References (2)
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Note (1): Notes as follows:
* = WISE data indicate saturation.
** = Although an RV Tauri pulsator (Lloyd Evans, 1999IAUS..191..453L 1999IAUS..191..453L;
Kiss et al. 2007MNRAS.375.1338K 2007MNRAS.375.1338K, but not in the GCVS), we include this
object in the reference sample because it is a well-characterized disc
object.
Note (2): References as follows:
1 = de Ruyter et al. (2005A&A...435..161D 2005A&A...435..161D)
2 = Gorlova et al. (2012A&A...542A..27G 2012A&A...542A..27G)
3 = Maas, Giridhar & Lambert (2007ApJ...666..378M 2007ApJ...666..378M)
4 = Oudmaijer et al. (1995A&A...299...69O 1995A&A...299...69O)
5 = Van Winckel, Oudmaijer & Trams (1996A&A...312..553V 1996A&A...312..553V)
6 = Hrivnak & Bieging (2005ApJ...624..331H 2005ApJ...624..331H)
7 = Fujii, Nakada & Parthasarathy (2001, Astrophysics and Space Science
Library Vol. 265, Post-AGB Objects as a Phase of Stellar Evolution.
Szczerba R., Gorny S. K., editors. Dordrecht: Kluwer; p. 45.)
8 = Klochkova & Chentsov (2007ARep...51..994K 2007ARep...51..994K)
9 = Sanchez Contreras et al. (2006ApJ...643..945S 2006ApJ...643..945S)
10 = Min et al. (2013A&A...554A..15M 2013A&A...554A..15M)
11 = Meixner et al. (2004ApJ...614..371M 2004ApJ...614..371M)
12 = Van Winckel & Reyniers (2000A&A...354..135V 2000A&A...354..135V)
13 = Gauba & Parthasarathy (2003A&A...407.1007G 2003A&A...407.1007G)
14 = Omont et al. (1993, Cat. J/A+A/267/515)
15 = Bujarrabal et al. (2001A&A...377..868B 2001A&A...377..868B)
16 = Hrivnak, Volk & Kwok (2000ApJ...535..275H 2000ApJ...535..275H)
17 = Hrivnak et al. (2011ApJ...734...25H 2011ApJ...734...25H)
18 = Woods et al. (2005A&A...429..977W 2005A&A...429..977W)
19 = Wannier et al. (1990ApJ...358..251W 1990ApJ...358..251W)
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Acknowledgements:
Ilknur Gezer, ilknur.gezer(at)ege.edu.tr
(End) Patricia Vannier [CDS] 25-Aug-2015