Data Model: table_2

General Description
This table reports the multi-wavelength properties of the UCDs and UCD candidates identified as bona-fide or plausible counterparts to an eRASS1 X-ray source.
Naming Convention
This file corresponds to Table 2 in the eROPub138 splash paper: A first eROSITA view of ultracool dwarfs (Stelzer+ 2021).
Filename: table_2.fits
Approximate Size
19 KB
File Type
FITS
Generated by Product
eSASS (software used to generate the date product, add links)

Sections

Content of the page.

HDU0: PRIMARY

[Write text to summarize contents of this HDU]

HDU Type
IMAGE
HDU Size
4 KB
Header Table Caption for HDU0
KeyValueTypeComment

HDU1: Joined

Data for the 58 UCDs and UCD candidates identified as bona-fide or plausible counterparts to an eRASS1 X-ray source.

HDU Type
BINARY TABLE
HDU Size
5 KB
Header Table Caption for HDU1
KeyValueTypeComment
Binary Table Caption for HDU1
NameTypeUnitDescription
source_id int64 None Gaia DR2 designation of the UCD
Gmag float32 mag G-band magnitude from the Gaia DR2 catalog
Jmag float64 mag J-band magnitude from the 2MASS All-Sky PSC catalog
W1mag float64 mag W1-band magnitude from the AllWISE catalog
spt_opt char[7] None Spectroscopic spectral type in visual bandpass from GagnéM
spt_photo char[8] None Photometric spectral type from the G-J color index [note1]
dist float64 pc Distance estimated by Bailer-Jones et al. (2018)
elo_dist float64 pc Lower error on the distance estimated by Bailer-Jones et al. (2018)
eup_dist float64 pc Upper error on the distance estimated by Bailer-Jones et al. (2018)
LogLx float64 erg/s log of Lx for the eROSITA band 1+2 [note2]
LogLxLbol float64 None log of Lx for the eROSITA band 1+2 with Lbol from Filippazzo et al. (2015)
flag_young bool None Flag for young stars
ref_young char[5] None References indicating young stars
flag_binary bool None Flag for binary systems
ref_binary char[2] None References indicating binary systems

GagnéM refers to the online database of "M6- M9 dwarfs" maintained by J. Gagné.
[note1] We make use of the "Stellar Color/Teff Table" maintained by E. Mamajek.
[note2] The X-ray flux in the eROSITA band 1+2 is estimated from the count rates in the eRASS1 catalog and the rate-to-flux conversion factor of
7.37 10-13 erg/cts/cm2 that is computed as in Magaudda et al. (this volume). We calculated log of Lx with the Bailer-Jones et al. (2018) distance.

References for the Young and Binary flags

[1] Mason et al. 2001. The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog (Vizier catalog: B/wds)

[2] Carpenter et al. 2002. Near-Infrared Photometric Variability of Stars toward the Chamaeleon I Molecular Cloud (Vizier catalog: J/AJ/124/1001)

[3] Song et al. 2003. New Members of the TW Hydrae Association, β Pictoris Moving Group, and Tucana/Horologium Association

[4] Bonnefoy et al. 2009. The young, tight, and low-mass binary TWA22AB: a new calibrator for evolutionary models?. Orbit, spectral types, and temperature

[5] Shkolnik et al. 2009. Identifying the Young Low-mass Stars within 25 pc. I. Spectroscopic Observations (Vizier catalog: J/ApJ/699/649)

[6] Shkolnik et al. 2012. Identifying the Young Low-mass Stars within 25 pc. II. Distances, Kinematics, and Group Membership (Vizier catalog: J/ApJ/758/56)

[7] Kraus et al. 2014. A Stellar Census of the Tucana-Horologium Moving Group (Vizier catalog: J/AJ/147/146)

[8] Artigau et al. 2015. BANYAN. VI. Discovery of a Companion at the Brown Dwarf/Planet-Mass Limit to a Tucana-Horologium M Dwarf

[9] Gagné et al. 2015. BANYAN. VII. A New Population of Young Substellar Candidate Members of Nearby Moving Groups from the BASS Survey (Vizier catalog: J/ApJS/219/33)

[10] Gagné et al. 2015. BANYAN. V. A Systematic All-sky Survey for New Very Late-type Low-mass Stars and Brown Dwarfs in Nearby Young Moving Groups (Vizier catalog: J/ApJ/798/73)

[11] Gagné & Faherty 2018. BANYAN. XIII. A First Look at Nearby Young Associations with Gaia Data Release 2 (Vizier catalog: J/ApJ/862/138)

[12] Luhman et al. 2018. New Young Stars and Brown Dwarfs in the Upper Scorpius Association (Vizier catalog: J/AJ/156/76)

[13] Winters et al. 2019. The Solar Neighborhood. XLV. The Stellar Multiplicity Rate of M Dwarfs Within 25 pc (Vizier catalog: J/AJ/157/216)

[14] Luhman & Esplin 2020. Refining the Census of the Upper Scorpius Association with Gaia (Vizier catalog: J/AJ/160/44)

References

Skrutskie et al. 2006. The Two Micron All Sky Survey (2MASS) (Vizier catalog: II/246)

Wright et al. 2010. The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance (Vizier catalog: II/328)

Filippazzo et al. 2015. Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime

Gaia Collaboration, Brown et al. 2018. Gaia Data Release 2. Summary of the contents and survey properties (Vizier catalog: I/345)

Bailer-Jones et al. 2018. Estimating Distance from Parallaxes. IV. Distances to 1.33 Billion Stars in Gaia Data Release 2 (Vizier catalog: I/347)

Predehl et al. 2020. The eROSITA X-ray telescope on SRG

Acknowledgement

The eROSITA data model structure for catalogues was branched from the SDSS data model for value added catalogues.