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J/A+A/606/A76       The ESO DIBs Large Exploration Survey           (Cox+, 2017)

The ESO Diffuse Interstellar Bands Large Exploration Survey (EDIBLES). I. Project description, survey sample, and quality assessment. Cox N.L.J., Cami J., Farhang A., Smoker J., Monreal-ibero A., Lallement R., Sarre P.J., Marshall C.C.M., Smith K.T., Evans C.J., Royer P., Linnartz H., Cordiner M.A., Joblin C., van Loon J.T., Foing B.H., Bhatt N.H., Bron E., Elyajouri M., de Koter A., Ehrenfreund P., Javadi A., Kaper L., Khosroshadi H.G., Laverick M., Le Petit F., Mulas G., Roueff E., Salama F., Spaans M. <Astron. Astrophys. 606, A76 (2017)> =2017A&A...606A..76C (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Extinction ; Interstellar medium Keywords: ISM: lines and bands - ISM: clouds - ISM: molecules - dust, extinction - stars: early-type - local interstellar matter Abstract: The carriers of the diffuse interstellar bands (DIBs) are largely unidentified molecules ubiquitously present in the interstellar medium (ISM). After decades of study, two strong and possibly three weak near-infrared DIBs have recently been attributed to the C+60 fullerene based on observational and laboratory measurements. There is great promise for the identification of the over 400 other known DIBs, as this result could provide chemical hints towards other possible carriers. In an effort to systematically study the properties of the DIB carriers, we have initiated a new large-scale observational survey: the ESO Diffuse Interstellar Bands Large Exploration Survey (EDIBLES). The main objective is to build on and extend existing DIB surveys to make a major step forward in characterising the physical and chemical conditions for a statistically significant sample of interstellar lines-of-sight, with the goal to reverse-engineer key molecular properties of the DIB carriers. EDIBLES is a filler Large Programme using the Ultraviolet and Visual Echelle Spectrograph at the Very Large Telescope at Paranal, Chile. It is designed to provide an observationally unbiased view of the presence and behaviour of the DIBs towards early-spectral-type stars whose lines-of-sight probe the diffuse-to-translucent ISM. Such a complete dataset will provide a deep census of the atomic and molecular content, physical conditions, chemical abundances and elemental depletion levels for each sightline. Achieving these goals requires a homogeneous set of high-quality data in terms of resolution (R∼70000-100000), sensitivity (S/N up to 1000 per resolution element), and spectral coverage (305-1042nm), as well as a large sample size (100+ sightlines). In this first paper the goals, objectives and methodology of the EDIBLES programme are described and an initial assessment of the data is provided. Description: We constructed a statistically representative survey sample that probes a wide range of interstellar environment parameters including reddening E(B-V), visual extinction AV, total-to-selective extinction ratio RV, and molecular hydrogen fraction fH2. EDIBLES provides the community with optical (∼305-1042nm) spectra at high spectral resolution (R∼70000 in the blue arm and 100000 in the red arm) and high signal-to-noise (S/N; median value ∼500-1000), for a statistically significant sample of interstellar sightlines. Many of the >100 sightlines included in the survey already have auxiliary available ultraviolet, infrared and/or polarisation data on the dust and gas components. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 96 96 Targets observed for EDIBLES tablea2.dat 96 18 Observations planned to complete the EDIBLES sample
Byte-by-byte Description of file: tablea1.dat tablea2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 12 I2 h RAh Right ascension (J2000) 14- 15 I2 min RAm Right ascension (J2000) 17- 20 F4.1 s RAs Right ascension (J2000) 22 A1 --- DE- Declination sign (J2000) 23- 24 I2 deg DEd Declination (J2000) 26- 27 I2 arcmin DEm Declination (J2000) 29- 32 F4.1 arcsec DEs Declination (J2000) 34- 56 A23 --- SpType MK spectral type 58- 60 A3 --- r_SpType Reference for spectral type (1) 62- 65 F4.2 mag E(B-V) ?=- Interstellar reddenning (2) 67- 70 F4.2 --- RV ?=- Total-to-selective extinction ratio 72- 75 F4.2 mag AV ?=- Visual extinction 77- 79 A3 --- r_AV Reference for AV (1) 81- 85 F5.2 [cm-2] logNHI ?=- HI column density (3) 87- 91 F5.2 [cm-2] logNH2 ?=- H2 column density (3) 93- 96 F4.2 --- fH2 ?=- Molecular hydrogen fraction
Note (1): References as follows: A69 = Abt & Morgan, 1969AJ.....74..813A C69 = Cowley et al., 1969AJ.....74..375C E05 = Evans et al., 2005R, Cat. J/A+A/437/467 F57 = Feast et al., 1957MmRAS..68....1F G01 = Gray et al., 2001, Cat. J/AJ/121/2148 G68 = Guetter, 1968PASP...80..197G G77 = Garrison et al., 1977ApJS...35..111G G94 = Garrison & Gray, 1994, Cat. J/AJ/107/1556 H13 = Holberg et al., 2013, Cat. J/MNRAS/435/2077 H56 = Hiltner, 1956, Cat. J/ApJS/2/389 H69 = Hiltner et al., 1969ApJ...157..313H H73 = Humphreys, 1973A&AS....9...85H H78 = Houk, 1978, Cat. III/51 H82 = Hendry, 1982PASP...94..169H L06 = Levenhagen & Leister 2006) L68 = Lesh, 1968ApJS...17..371L, Cat. III/23 L75 = Levato, 1975A&AS...19...91L L76 = Levato & Abt, 1976PASP...88..712L M50 = Morgan & Roman, 1950ApJ...112..362M M55 = Morgan et al., 1955ApJS....2...41M M73 = Morgan & Keenan, 1973ARA&A..11...29M M95 = Massey et al., 1995, Cat. J/ApJ/454/151 O59 = Osawa, 1959ApJ...130..159O P98 = Parsons & Ake, 1998, Cat. J/ApJS/119/83 R09 = Renson & Manfroid, 2009A&A...498..961R, Cat. III/260 S11 = Sota et al., 2011ApJS..193...24S, Cat. III/274 S14 = Sota et al., 2014ApJS..211...10S, Cat. III/274 S52 = Sharpless, 1952ApJ...116..251S S56 = Stebbins & Kron, 1956ApJ...123..440S, classification originally from W. W. Morgan S71 = Schild & Chaffee, 1971ApJ...169..529S S99 = Steele et al., 1999A&AS..137..147S V04 = Valencic et al., 2004ApJ...616..912V), Fitzpatrick & Massa (2007, Cat. J/ApJ/663/320) W03 = Wegner, 2003, Cat. J/AN/324/219 W71 = Walborn, 1971ApJS...23..257W W76 = Walborn, 1976ApJ...205..419W Note (2): The interstellar reddening, E(B-V), was computed from (B-V)J colours (taking the average from Tycho-2 and Simbad B-V colours; where Tycho-2 colours were converted to Johnson colours; Mamajek et al. (2002, Cat. J/AJ/124/1670) and the published spectral classifications, adopting intrinsic colours from Fitzgerald (1970A&A.....4..234F). Note (3): From Jenkins (2009, Cat. J/ApJ/700/1299).
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Jan-2018
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