J/MNRAS/427/2180 GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012)
A selection of hot subluminous stars in the GALEX survey.
II. Subdwarf atmospheric parameters.
Nemeth P., Kawka A., Vennes S.
<Mon. Not. R. Astron. Soc., 427, 2180-2211 (2012)>
=2012MNRAS.427.2180N 2012MNRAS.427.2180N (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, subdwarf ; Stars, atmospheres ; Abundances
Keywords: catalogues - surveys - stars: abundances - stars: atmospheres -
binaries: spectroscopic - subdwarfs
Abstract:
We present an update of our low-resolution spectroscopic follow-up and
model atmosphere analysis of hot subdwarf stars from the Galaxy
Evolution Explorer (GALEX) survey. Targets were selected on the basis
of colour indices calculated from the GALEX GR6 NUV, Guide Star
Catalogue (GSC2.3.2) Vand the Two Micron All Sky Survey (2MASS) J and
H photometry. High signal-to-noise ratio spectra were obtained at the
European Southern Observatory (ESO) and the Kitt Peak National
Observatory (KPNO) over the course of three years. Detailed H, He and
CNO abundance analysis helped us improve our Teff, logg and He
abundance determination and to constrain CNO abundances. We processed
191 observations of 180 targets and found 124 sdB and 42 sdO stars in
this sample while some blue horizontal branch stars were also found in
this programme. With quantitative binary decomposition of 29 composite
spectra we investigated the incidence of A, F and G type companions.
The incidence of late G and K type companions and their effects on
subdwarf atmospheric parameters were also examined.
Description:
Low-dispersion optical spectra were obtained at two sites during seven
observing runs between 2008 and 2011. At ESO, we used the ESO Faint
object Spectrograph and Camera (EFOSC2) attached to the 3.6m NTT at
the La Silla Observatory. On ut 2008 October 19-22, 2009 March 2-4
and 2009 August 23-27, we used grism 11 (300-lines/mm) with a
dispersion of ∼4.17Å per binned pixel (2x2). With a 1-arcsec slit
width we obtained a resolution of Δλ∼13.7Å. On ut 2010
March 2-4 and 2010 September 18-21 we employed grism 7 (600-lines/mm,
∼1.96 Å per binned pixel) and a 1-arcsec slit width resulting in a
resolution of Δλ∼6.4Å.
At Kitt Peak National Observatory (KPNO) on ut 2010 March 23-26 and
2011 January 28-31 the Ritchey-Chretien Focus Spectrograph (RC
spectrograph) was used with the 4-m Mayall telescope and KPC-10A
(316lines/mm) grating, delivering a spectral resolution of
Δλ∼5Å in first order. The slit width was set at
1.5-arcsec resulting in a dispersion of ∼2.75Å per pixel.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 191 187 Atmospheric parameters of hot subdwarf stars in
the GALEX survey (Single stars and primaries)
table2b.dat 57 27 Atmospheric parameters of hot subdwarf stars in
the GALEX survey (Companions)
table3.dat 187 5 Other targets that are not part of the GALEX UV
selection (Single stars and primaries)
table3b.dat 57 2 Other targets that are not part of the GALEX UV
selection (Companions)
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Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- GALEX GALEX J designation (HHMMSS.ss+DDMMSS.ssA)
20 A1 --- m_GALEX [A] Multiplicity index on GALEX
22- 27 A6 --- SpType MK spectral type
29- 33 F5.2 mag NUV ?=- NUV magnitude
35- 39 F5.2 mag Vmag ?=- V magnitude
41- 45 I5 K Teff Effective temperature
47- 51 I5 K E_Teff ?=- Error on Teff (upper value)
53- 56 I4 K e_Teff ?=- Error on Teff (lower value)
58- 61 F4.2 [cm/s2] logg Surface gravity
63- 66 F4.2 [cm/s2] E_logg ?=- Error on logg (upper value)
68- 71 F4.2 [cm/s2] e_logg ?=- Error on logg (lower value)
73 A1 --- l_[He/H] Limit flag on [He/H]
74- 78 F5.2 [-] [He/H] Abundance [He/H]
80- 83 F4.2 [-] E_[He/H] ?=- Error on [He/H] (upper value)
85- 88 F4.2 [-] e_[He/H] ?=- Error on [He/H] (lower value)
90 A1 --- l_[C/H] Limit flag on [C/H]
91- 95 F5.2 [-] [C/H] Abundance [C/H]
97-100 F4.2 [-] E_[C/H] ?=- Error on [C/H] (upper value)
102-105 F4.2 [-] e_[C/H] ?=- Error on [C/H] (lower value)
107 A1 --- l_[N/H] Limit flag on [N/H]
108-112 F5.2 [-] [N/H] Abundance [N/H]
114-117 F4.2 [-] E_[N/H] ?=-Error on [N/H] (upper value)
119-122 F4.2 [-] e_[N/H] ?=-Error on [N/H] (lower value)
124 A1 --- l_[O/H] Limit flag on [O/H]
125-129 F5.2 [-] [O/H] Abundance [O/H]
131-134 F4.2 [-] E_[O/H] ?=- Error on [O/H] (upper value)
136-139 F4.2 [-] e_[O/H] ?=- Error on [O/H] (lower value)-
141 A1 --- l_E(B-V) Linit flag on E(B-V)
142-145 F4.2 mag E(B-V) Interstellar redenning
147-152 F6.3 mag V-J ?=- V-J colour index
154-159 F6.3 mag J-H ?=- J-H colour index
161-172 A12 --- Com Comments (1)
174-191 A18 --- OName Other name
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Note (1): Comments as follows:
c = Contamination, scattered light from a nearby star
t = See text; further details can be found in Section 8.1
7 = spectral resolution: ESO/NTT/EFOSC2, grims 7, Dλ=6.4Å
11 = spectral resolution: ESO/NTT/EFOSC2, grims 11, Dλ=13.7Å
If resolution is not given:
NOAO/Mayall/RC, grating KPC-10A, Dλ=4.95Å
d = Binary decomposition degeneracy: components are either similar type,
or a high metallicity single line binary
b = Spectral signatures of a cool companion
RV = Radial velocity curve proves a close binary
rv = Radial velocity with respect to the kinematic LSR is over 100km/s
f = Poor fluxing below 4500Å
ca = CaII H&K line: indicating a cool companion or interstellar absorption
na = NaI D line: indicating a cool companion or interstellar absorption
he = HeI/HeII line inconsistency
M = Data are taken from the Miles library
C&N = C&N λ4640-λ4665Å bland
s = Possible slow pulsator
r = Possible rapid pulsator
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Byte-by-byte Description of file: table[23]b.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- GALEX GALEX J designation (HHMMSS.ss+DDMMSS.ssA)
20 A1 --- m_GALEX [B] Multiplicity index on GALEX
22- 29 A8 --- SpType MK spectral type
31- 34 I4 K Teff Effective temperature
36- 39 F4.2 [cm/s2] logg Surface gravity
41- 45 F5.2 [-] [He/H] Abundance [He/H]
47- 51 F5.3 mag V-J ?=- V-J colour index
53- 57 F5.3 mag J-H ?=- J-H colour index
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Acknowledgements:
Peter Nemeth, pnemeth1981(at)gmail.com
References:
Vennes et al., Paper I 2011MNRAS.410.2095V 2011MNRAS.410.2095V
(End) Patricia Vannier [CDS] 30-Nov-2015