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J/ApJ/850/34     3000-25000Å spectroscopy of nearby M dwarfs     (Bar+, 2017)

A spectroscopic search for white dwarf companions to 101 nearby M dwarfs. Bar I., Vreeswijk P., Gal-Yam A., Ofek E.O., Nelemans G. <Astrophys. J., 850, 34 (2017)> =2017ApJ...850...34B
ADC_Keywords: Stars, M-type; Spectral types; Stars, double and multiple; Spectra, optical; Spectra, infrared; Stars, distances Keywords: binaries: general ; stars: late-type ; white dwarfs Abstract: Recent studies of the stellar population in the solar neighborhood (<20pc) suggest that there are undetected white dwarfs (WDs) in multiple systems with main-sequence companions. Detecting these hidden stars and obtaining a more complete census of nearby WDs is important for our understanding of stellar and galactic evolution, as well as the study of explosive phenomena. In an attempt to uncover these hidden WDs, we present intermediate resolution spectroscopy over the wavelength range of 3000-25000Å of 101 nearby M dwarfs (dMs), observed with the Very Large Telescope X-Shooter spectrograph. For each star we search for a hot component superimposed on the dM spectrum. X-Shooter has excellent blue sensitivity and thus can reveal a faint hot WD despite the brightness of its red companion. Visual examination shows no clear evidence of a WD in any of the spectra. We place upper limits on the effective temperatures of WDs that may still be hiding by fitting dM templates to the spectra and modeling the WD spectra. On average our survey is sensitive to WDs hotter than about 5300K. This suggests that the frequency of WD companions of Teff≳5300K with separation of the order of ≲50 au among the local dM population is <3% at the 95% confidence level. Description: The observations were performed with the X-Shooter spectrograph mounted at the Kueyen unit of the Very Large Telescope (UT2), operated by the European Southern Observatory (ESO) on Cerro Paranal in Chile (Program IDs 095_D-0949(A) --2015 Apr to Sept-- and 096_D-0963(A), PI: Paul Vreeswijk --2015 Oct to 2016 Feb). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 46 101 Obtained results of spectral analysis table2.dat 98 101 Observed M dwarfs
See also: B/eso : ESO Science Archive Catalog (ESO, 1991-2018) B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/PASP/110/863 : A Stellar Spectral Flux Library: 1150 - 25000 A (Pickles 1998) J/ApJS/133/413 : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001) J/ApJ/571/512 : Distances of white dwarf stars (Holberg+, 2002) J/AJ/128/426 : Subdwarfs in the SDSS (West+, 2004) J/AJ/132/1221 : VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006) J/AJ/135/1225 : Parameters of the local white dwarfs (Holberg+, 2008) J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009) J/AJ/138/1681 : WD within 20pc of the Sun (Sion+, 2009) J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010) J/PASP/122/885 : Gliese cat. star/2MASS cross identifications (Stauffer+, 2010) J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011) J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013) J/A+A/565/A117 : X-Shooter Spectral Library (XSL). DR1 (Chen+, 2014) J/MNRAS/437/1216 : VAST Survey. A-type stars multiplicity (De Rosa+, 2014) J/A+A/568/A9 : 300-2500nm flux calibration reference spectra (Moehler+, 2014) J/ApJ/817/1 : Palomar/MSU & SDSS-DR7 M dwarfs with GALEX obs. (Jones+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Name 10- 17 A8 --- Temp Template Name 19- 23 I5 K RSS [3750/10500]? Template temperature limit from Residual Sum of Squares (RSS) score 25- 28 I4 K Env [5000/9500]? Template temperature limit from fit residuals envelope 30- 33 I4 K Blue [3750/8500] Template temperature limit from total blue flux 35- 36 A2 --- Act Activity (1) 38- 46 A9 arcsec Sep Companion separation from WDS (2)
Note (1): Activity - B+Ca = Balmer and CaII emission lines; Ca = CaII lines only; D = Double emission lines (Balmer and CaII). Note (2): Companion separations, in arcseconds, from the WDS catalog, listed for targets where at least one companion is closer than 2.5 arcseconds. Multiple companion separations delineate by "+". The separation of NN3129 is given a value "?" as it was listed as binary in Shkolnik+ (2010ApJ...716.1522S) but no separation was reported.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Name 10- 11 I2 h RAh Hour of Right Ascension (J2000) 13- 14 I2 min RAm Minute of Right Ascension (J2000) 16- 20 F5.2 s RAs Second of Right Ascension (J2000) 22 A1 --- DE- Sign of the Declination (J2000) 23- 24 I2 deg DEd Degree of Declination (J2000) 26- 27 I2 arcmin DEm Arcminute of Declination (J2000) 29- 32 F4.1 arcsec DEs Arcsecond of Declination (J2000) 34- 42 A9 --- SpT MK Spectral Type (M2 to M7) from SIMBAD 44- 48 F5.2 mag Vmag [10.4/16] Apparent V band magnitude from Gliese+, 1991, V/70 50- 54 F5.2 pc Dist [2.9/20] Distance from Gliese+, 1991, V/70 56- 65 A10 "Y/M/D" Obs.date Observation date 67- 74 A8 "h:m:s" Obs.time Observation time, UTC 76- 80 F5.3 --- Airmass [1/2.3] Airmass 82- 84 F3.1 arcsec Seeing [0.3/1.6] Seeing 86- 88 I3 s UVB [60/360] UVB Exposure 90- 92 I3 s VIS [30/300] VIS Exposure 94 I1 --- nNIR [4] NIR Exposure, coadds 96- 98 I3 s NIR [10/100] NIR Exposure
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Jun-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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