J/MNRAS/432/3186 Symbiotic stars towards the Galactic bulge (Miszalski+, 2013)
Symbiotic stars and other Hα emission-line stars towards the
Galactic bulge.
Miszalski B., Mikolajewska J., Udalski A.
<Mon. Not. R. Astron. Soc., 432, 3186-3217 (2013)>
=2013MNRAS.432.3186M 2013MNRAS.432.3186M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, infrared
Keywords: surveys - binaries: symbiotic - stars: carbon -
stars: emission-line, Be - planetary nebulae: general - Galaxy: bulge
Abstract:
Symbiotic stars are interacting binaries with the longest orbital
periods, and their multicomponent structure makes them rich
astrophysical laboratories. The accretion of a high-mass-loss-rate red
giant wind on to a white dwarf (WD) makes them promising Type Ia
supernova (SN Ia) progenitors. Systematic surveys for new Galactic
symbiotic stars are critical to identify new promising SN Ia
progenitors (e.g. RS Oph) and to better estimate the total population
size to compare against SN Ia rates. Central to the latter objective
is building a complete census of symbiotic stars towards the Galactic
bulge. Here we report on the results of a systematic survey of
Hα emission-line stars covering 35 deg2. It is distinguished
by the combination of deep optical spectroscopy and long-term light
curves that improve the certainty of our classifications. A total of
20 bona fide symbiotic stars are found (13 S-types, 6 D-types and 1
D'-type), 35 per cent of which show the symbiotic specific
Raman-scattered Ovi emission bands, as well as 15 possible symbiotic
stars that require further study (six S-types and nine D-types). Light
curves show a diverse range of variability including stellar
pulsations (semi-regular and Mira), orbital variations and slow
changes due to dust. Orbital periods are determined for five S-types
and Mira pulsation periods for three D-types. The most significant
D-type found is H1-45 and its carbon Mira with a pulsation period of
408.6d, corresponding to an estimated period-luminosity relation
distance of ∼6.2±1.4kpc and MK=-8.06±0.12mag. If H1-45 belongs
to the Galactic bulge, then it would be the first bona fide luminous
carbon star to be identified in the Galactic bulge population. The
lack of luminous carbon stars in the bulge is a longstanding unsolved
problem. A possible explanation for H1-45 may be that the carbon
enhancement was accreted from the progenitor of the WD companion. A
wide variety of unusual emission-line stars were also identified.
These include central stars of planetary nebulae (PNe) [one (WC10-11)
Wolf-Rayet and five with high-density cores], two novae, two WN6
Wolf-Rayet stars, two possible Be stars, a B[e] star with a bipolar
outflow, an ultracompact HII region and a dMe flare star. Dust
obscuration events were found in two central stars of PNe, increasing
the known cases to five, as well as one WN6 star. There is
considerable scope to uncover several more symbiotic stars towards the
bulge, many of which are currently misclassified as PNe, provided that
deep spectroscopy is combined with optical and near-infrared light
curves.
Description:
We have conducted a survey of Hα emission-line stars towards the
Galactic bulge covering ∼35 deg2. Deep optical spectroscopy and
I-band long-term light curves were presented for most of the sample,
revealing 20 new and 15 possible symbiotic stars, as well as several
other unusual emission-line stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 115 35 2MASS and GLIMPSE magnitudes of new and
possible symbiotic stars.
tablea2.dat 115 19 2MASS and GLIMPSE magnitudes of other objects
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See also:
J/A+AS/93/383 : UBVRIJHKL photometry of symbiotic stars (Munari+ 1992)
J/A+A/333/658 : D-type symbiotic stars emission line fluxes (Pereira+ 1998)
J/A+A/343/841 : Imaging of symbiotic stars (Corradi+ 1999)
J/A+AS/146/407 : Symbiotic stars catalogue (Belczynski+, 2000)
J/A+A/370/503 : BV(RI)c photometry of 7 symbiotic stars (Munari+, 2001)
J/A+A/372/145 : Symbiotic stars UBV(RI)c photometry. II. (Henden+, 2001)
J/A+A/383/188 : Spectrophotometric atlas of symbiotic stars (Munari+, 2002)
J/A+A/386/237 : UBV(RI)c photometry of 7 symbiotic stars (Munari+, 2002)
J/A+A/435/1087 : Nebular abundances of southern symbiotic stars (Luna+, 2005)
J/A+A/458/339 : Symbiotic stars UBV(RI)c photometry. III. (Henden+, 2006)
J/A+A/480/409 : IPHAS symbiotic stars candidates (Corradi+, 2008)
J/BaltA/17/293 : Symbiotic stars multi-epoch UBV(RI)c photometry (Henden+ 2008)
J/PASP/122/35 : Symbiotic stars on Asiago archive plates (Jurdana-Sepic+ 2010)
J/AN/333/242 : Recent photometry of symbiotic stars (Skopal+, 2012)
J/A+A/567/A49 : Spectra of IPHAS symbiotic stars (Rodriguez-Flores+, 2014)
J/AJ/153/35 : Infrared spectroscopy of symbiotic stars. XI. (Fekel+, 2017)
Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Name
15- 16 I2 h RAh Right ascension (J2000)
18- 19 I2 min RAm Right ascension (J2000)
21- 24 F4.1 s RAs Right ascension (J2000)
26 A1 --- DE- Declination sign (J2000)
27- 28 I2 deg DEd Declination (J2000)
30- 31 I2 arcmin DEm Declination (J2000)
33- 34 I2 arcsec DEs Declination (J2000)
36- 53 A18 --- Type Spectral type (1)
55- 59 F5.2 mag Jmag ?=- 2MASS J magnitude
61- 65 F5.2 mag Hmag ?=- 2MASS H magnitude
67- 71 F5.2 mag Ksmag ?=- 2MASS Ks magnitude
73- 76 F4.2 mag J-H ?=- 2MASS J-H colour index
78- 82 F5.2 mag H-Ks ?=- 2MASS H-Ks colour index
84- 87 F4.2 mag J-Ks ?=- 2MASS J-Ks colour index
89- 91 A3 --- Qflag 2MASS photometric flags
93- 97 F5.2 mag [3.6] ?=- GLIMPSE 3.6um magnitude
99-103 F5.2 mag [4.5] ?=- GLIMPSE 4.5um magnitude
105-109 F5.2 mag [5.8] ?=- GLIMPSE 5.8um magnitude
111-115 F5.2 mag [8.0] ?=- GLIMPSE 8.0um magnitude
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Note (1): S for S-type symbiotic star, D for D-type symbiotic star.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Nov-2018