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J/A+A/610/A64    Distance to the clouds in Chamaeleon complex    (Voirin+, 2018)

A revised estimate of the distance to the clouds in the Chamaeleon complex using the Tycho-Gaia Astrometric Solution. Voirin J., Manara C.F., Prusti T. <Astron. Astrophys. 610, A64 (2018)> =2018A&A...610A..64V (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, distances ; Effective temperatures ; Spectral types Keywords: stars: distances - stars: formation - dust, extinction - Galaxy: open clusters and associations: individual: Chamaeleon - ISM: clouds Abstract: The determination of the distance to dark star-forming clouds is a key parameter to derive the properties of the cloud itself, and of its stellar content. This parameter is still loosely constrained even in nearby star- forming regions. We want to determine the distances to the clouds in the Chamaeleon-Musca complex and to explore the connection between these clouds and the large scale cloud structures in the galaxy. We use the newly estimated distances obtained from the parallaxes measured by the Gaia satellite and included in the Tycho-Gaia Astrometric Solution catalog. When known members of a region are included in this catalog we use their parallaxes to infer the distance to the cloud. Otherwise, we analyze the dependence of the color excess on the distance of the stars and look for a turn-on of this excess, which is a proxy of the position of the front-edge of the star-forming cloud. We are able to measure the distance to the three Chamaeleon clouds. The distance to Chamaeleon I is 179+11+11-10-10pc, where the quoted uncertainties are statistical and systematic uncertainties, respectively, 20 pc further away than previously assumed. The Chamaeleon II cloud is located at the distance of 181+6+11-5-10pc, which agrees with previous estimates. We are able to measure for the first time a distance to the Chamaeleon III cloud of 199+8+12-7-11pc. Finally, the distance of the Musca cloud is smaller than 603+91+133-70-92pc. These estimates do not allow us to distinguish between the possibility that the Chamaeleon clouds are part of a sheet of clouds parallel to the galactic plane, or perpendicular to it. We have measured a larger distance to the Chamaeleon I cloud than assumed in the past, confirmed the distance to the Chamaeleon II region, and measured for the first time the distance to the Chamaleon III cloud. These values are consistent with the scenario where the three clouds are part of a single large scale structure. Gaia Data Release 2 will allow us to put more stringent constraints on the distances to these clouds by giving us access to parallax measurements for a larger number of members of these regions. Description: Catalog of stars on the line of sight of the Chamaeleon clouds used to determine the reddening turn-on distance. Reported are the V and B magnitudes, spectral types and/or effective temperatures, and their distances. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 90 59 Catalog of stars on the line of sight of Cha I table4.dat 90 44 Catalog of stars on the line of sight of Cha II table5.dat 90 39 Catalog of stars on the line of sight of Cha III table6.dat 90 76 Catalog of stars on the line of sight of Musca
See also: I/259 : The Tycho-2 Catalogue (Hog+ 2000) I/337 : Gaia DR1 (Gaia Collaboration, 2016) J/ApJ/833/119 : Distances of Gaia DR1 TGAS sources (Astraatmadja+, 2016) Byte-by-byte Description of file: table3.dat table4.dat table5.dat table6.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Name of the field star 17- 26 F10.6 deg RAdeg Right ascension (ICRS) at epoch 2015.0 28- 37 F10.6 deg DEdeg Declination (ICRS) at epoch 2015.0 39- 43 F5.2 mag VTmag Tycho V-Band magnitude (1) 45- 49 F5.2 mag BTmag Tycho B-Band magnitude (1) 51- 58 A8 --- SpType Spectral type and luminosity class 60- 63 I4 K Teff ?=- Effective temperature 65- 70 F6.3 mag E(B-V) B-V colour excess 72- 76 F5.3 mag e_E(B-V) 1 sigma uncertainty on E(B-V) 78- 81 I4 pc Dist Distance from TGAS (2) 83- 86 I4 pc e_Dist Uncertainty on the distance from TGAS 88- 90 A3 --- Ref Reference for Sptype or Teff (3)
Note (1): V and B magnitudes are taken from Tycho-2 catalog (Hog et al., 2000A&A...355L..27H, Cat. I/259) Note (2): The distances are taken from Astraatmadja & Bailer-jones (2016ApJ...833..119A, Cat. J/ApJ/833/119) based on TGAS. Note (3): References as follows: A1 = spectral type from Houk & Cowley, 1975mcts.book.....H, Cat. III/31 A2 = spectral type from Appenzeller, 1977A&A....61...21A A3 = spectral type from Vrba & Rydgren, 1984ApJ...283..123V A4 = spectral type from Bastian & Roeser, 1993psc..book.....B, Cat. I/193 A5 = spectral type from Nesterov et al, 1995A&AS..110..367N, Cat. III/182 A6 = spectral type from Stoy & Jackson, 1964, 1996yCat.1116....0J, Cat. I/116 A7 = spectral type from Torres et al., 2006A&A...460..695T, Cat. J/A+A/460/695 A8 = spectral type from Andersson et al, 2011A&A...534A..19A A9 = temperature from Ammons et al., 2006ApJ...638.1004A, Cat. V/136 A10 = temperature from Kordopatis et al., 2013AJ....146..134K, Cat. III/272 B1 = spectral type from Houk & Cowley, 1975mcts.book.....H, Cat. III/31 B2 = spectral type from Hughes & Hartigan, 1992AJ....104..680H B3 = spectral type from Bastian & Roeser, 1993psc..book.....B, Cat. I/193 B4 = spectral type from Stoy & Jackson, 1964, 1996yCat.1116....0J, Cat. I/116 B5 = temperature from Kordopatis et al., 2013AJ....146..134K C1 = spectral type from Houk & Cowley, 1975mcts.book.....H, Cat. III/31 C2 = spectral type from Bastian & Roeser, 1993psc..book.....B, Cat. I/193 C3 = spectral type from Torres et al., 2006A&A...460..695T, Cat. J/A+A/460/695 C4 = spectral type from Stoy & Jackson, 1964, 1996yCat.1116....0J, Cat. I/116 C5 = temperature from Ammons et al., 2006ApJ...638.1004A., Cat. V/136 C6 = temperature from Kordopatis et al., 2013AJ....146..134K D1 = spectral type from Houk & Cowley, 1975mcts.book.....H, Cat. III/31 D2 = temperature from Ammons et al., 2006ApJ...638.1004A., Cat. V/136 D3 = temperature from Kordopatis et al., 2013AJ....146..134K
Acknowledgements: Carlo Manara, cmanara(at)eso.org
(End) Patricia Vannier [CDS] 29-Nov-2017
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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