J/A+A/549/A131 Radio survey of ultracool dwarfs (Antonova+, 2013)
Volume-limited radio survey of ultracool dwarfs.
Antonova A., Hallinan G., Doyle J.G., Yu S., Kuznetsov A., Metodieva Y.,
Golden A., Cruz K.L.
<Astron. Astrophys., 549, A131 (2013)>
=2013A&A...549A.131A 2013A&A...549A.131A
ADC_Keywords: Stars, late-type ; Stars, dwarfs ; Radio sources ;
Infrared sources
Keywords: stars: low-mass - brown dwarfs - radiation mechanisms: general -
radio continuum: stars - masers
Abstract:
We aim to increase the sample of ultracool dwarfs studied in the radio
domain to allow a more statistically significant understanding of the
physical conditions associated with these magnetically active objects.
We conducted a volume-limited survey at 4.9GHz of 32 nearby ultracool
dwarfs with spectral types covering the range M7-T8. A statistical
analysis was performed on the combined data from the present survey
and previous radio observations of ultracool dwarfs.
Description:
The observations were conducted with the NRAO Very Large Array in the
period 09 August-09 September 2009 using the standard continuum mode
with 2x50MHz contiguous bands.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 94 219 Activity characteristics of all ultracool dwarfs
observed at radio frequencies.
--------------------------------------------------------------------------------
See also:
J/AJ/126/1526 : IR photometry of ultracool dwarfs (Bouy+, 2003)
J/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003)
J/AJ/126/2449 : Nearby ultracool dwarfs in galactic plane (Reid+, 2003)
J/A+A/416/655 : Ultracool dwarfs atomic lines in IR spectra (Lyubchik+ 2004)
J/A+A/446/515 : Distances of nearby ultracool dwarfs (Phan-Bao+, 2006)
J/AJ/133/439 : Luminosity function of M7-L8 ultracool dwarfs (Cruz+, 2007)
J/AJ/133/2258 : Activity and kinematics of ultracool dwarfs (Schmidt+, 2007)
J/MNRAS/382/515 : SDSS ultracool and halo WD candidates (Vidrih+, 2007)
J/AJ/136/1290 : Ultracool dwarfs from the 2MASS (Reid+, 2008)
J/A+A/493/L27 : Parallaxes of 10 ultracool subdwarfs (Schilbach+, 2009)
J/ApJ/723/684 : NIRSPEC ultracool dwarf RV survey (Blake+, 2010)
J/MNRAS/404/1817 : 2MASS/SDSS data for 806 ultracool dwarfs (Zhang+, 2010)
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- 2MASS 2MASS* designation (HHMMSSss+DDMMSSs) (1)
18- 33 A16 --- OName Other name
35- 39 A5 --- SpT MK spectral type
40- 45 F6.2 pc Dist Distance
47 A1 --- l_vsini Limit flag on vsini
48- 51 F4.1 km/s vsini ?=- Projected rotational velocity
54- 58 F5.2 Lsun Lbol ?=- Bolometric luminosity
60 A1 --- l_LHa/b Limit flag on LHa/b
61- 65 F5.2 --- LHa/b ?=- Hα to bolometric luminosity ratio
66 A1 --- n_LHa/b [f] f for fixed
67 A1 --- l_LX/b Limit flag on LX/b
68- 72 F5.2 --- LX/b ?=- X-ray to bolometric luminosity ratio
73 A1 --- n_LX/b [f] f for fixed
75 A1 --- l_Fnu [≲] Limit flag on Fnu
76- 80 I5 uJy Fnu ? Radio flux at 4.9GHz
82- 84 I3 uJy e_Fnu ? rms uncertainty on Fnu
86 A1 --- l_Lnu [≲] Limit flag on Lnu
87- 94 E8.3 10-7W/Hz Lnu ? Radio luminosity at 4.9GHz (erg/s/Hz)
--------------------------------------------------------------------------------
Note (1): 2MASS name (2MASS, 2MASSI or 2MASSW).
Data taken from this paper; McLean et al. (2012ApJ...746...23M 2012ApJ...746...23M);
Berger et al. (2010ApJ...709..332B 2010ApJ...709..332B); Route & Wolszczan (2012ApJ...747L..22R 2012ApJ...747L..22R);
Stelzer et al. (2012A&A...537A..94S 2012A&A...537A..94S); Grosso et al. (2007A&A...468..391G 2007A&A...468..391G);
Schmitt & Liefke (2004); Burgasser et al. (2003ApJ...594..510B 2003ApJ...594..510B);
Fleming et al. (1993ApJ...410..387F 1993ApJ...410..387F) and references therein.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Apr-2013