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J/A+A/401/959     35 DENIS late-M dwarfs between 10 and 30pc (Phan-Bao+, 2003)

New neighbours. V. 35 DENIS late-M dwarfs between 10 and 30 parsecs. Phan-Bao N., Crifo F., Delfosse X., Forveille T., Guibert J., Borsenberger J., Epchtein N., Fouque P., Simon G., Vetois J. <Astron. Astrophys., 401, 959-974 (2003)> =2003A&A...401..959P
ADC_Keywords: Stars, nearby ; Stars, M-type ; Photometry, infrared ; Proper motions Keywords: astrometry - stars: low mass, brown dwarfs - solar neighbourhood Abstract: This paper reports updated results on our systematic mining of the DENIS database (B/denis) for nearby very cool M-dwarfs (M6V-M8V, 2.0=<I-J=<3.0, photometric distance within 30pc), initiated by Phan-Bao et al. (2001, Cat. J/A+A/380/590, hereafter Paper I). We use M dwarfs with well measured parallaxes (HIP, GCTP,...) to calibrate the DENIS (MI, I-J) colour-luminosity relationship. The resulting distance error for single dwarfs is about 25%. Proper motions, as well as B and R magnitudes, were measured on archive Schmidt plates for those stars in the DENIS database that meet the photometric selection criteria. We then eliminate the giants by a Reduced Proper Motion cutoff, which is significantly more selective than a simple proper motion cutoff. It greatly reduces the selection bias against low tangential velocity stars, and results in a nearly complete sample. Here we present new data for 62 red dwarf candidates selected over 5700 square degrees in the DENIS database. 26 of those originate in the 2100 square degrees analysed in Paper I, with improved parameters here, and 36 were found in 3600 additional square degrees. 25 of those are new nearby dwarfs. In addition we cross-identified the NLTT and DENIS catalogues to find 15 similar stars, in parts of the sky not yet covered by the colour-selected search. We present distance and luminosity estimates for these 15 stars, 10 of which are newly recognized nearby dwarfs. A similar search in Paper I produced 4 red dwarf candidates, and we have thus up to now identified a total of 35 new nearby late-M dwarfs. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2a.dat 50 24 High proper motions of the 24 high-PM (pm>0.1"/yr) late-M dwarfs selected in the 3600 square degree table2b.dat 50 15 High proper motions of the 15 high-PM (pm>0.1"/yr) initially selected from the NLTT (I/98) table2c.dat 49 11 Low proper motions of 11 low-PM (pm<0.1"/yr) probable late-M dwarfs found in the 5700 square degrees table3a.dat 114 24 Observational data and reduced proper motions for the 24 high-PM (from 3600 square degree) table3b.dat 114 15 Observational data and reduced proper motions for the 15 high-PM (from NLTT) table3c.dat 117 11 Observational data and reduced proper motions for the 11 low-PM with Hi-Himax>1σ table5a.dat 56 35 Estimated distances and other parameters for the 24 stars of table2a and the 11 stars of table2c table5b.dat 50 15 Estimated distances and other parameters for the 15 stars of table2b
See also: B/denis : The DENIS database (Epchtein+, 1999) I/87 : LHS Catalogue, 2nd Edition (Luyten 1979) I/98 : NLTT Catalogue (Luyten, 1979) J/A+A/380/590 : 30 DENIS late-M dwarfs between 15 and 30pc (Phan-Bao+, 2001) Byte-by-byte Description of file: table2[abc].dat
Bytes Format Units Label Explanations
1 A1 --- Type [abc] Type of star (G1) 3- 17 A15 --- DENIS DENIS name (based on J2000 position) 18 A1 --- New [*] *: Not previously known as a high proper motion star 20- 24 I5 mas/yr pmRA Proper motion in right ascension 27- 31 I5 mas/yr pmDE Proper motion in declination 34- 35 I2 mas/yr e_pmRA ? pmRA error (table2c.dat only) 37- 38 I2 mas/yr e_pmDE ? pmDE error (table2c.dat only) 40- 43 I4 mas/yr pm Total proper motion 46- 49 I4 mas/yr pmL ? Total proper motion (1)
Note (1): Literature total proper motion, from Luyten catalogues (Cat. I/98, I/87) when available
Byte-by-byte Description of file: table3[abc].dat
Bytes Format Units Label Explanations
1 A1 --- Type [abc] Type of star (G1) 3- 17 A15 --- DENIS DENIS name (based on J2000 position) 18 A1 --- n_DENIS Note (1) 20- 29 A10 --- OName Other name (2) 31- 32 I2 h RAh Right ascension (J2000) at Epoch 34- 35 I2 min RAm Right ascension (J2000) at Epoch 37- 41 F5.2 s RAs Right ascension (J2000) at Epoch 44 A1 --- DE- Declination sign (J2000) at Epoch 45- 46 I2 deg DEd Declination (J2000) at Epoch 48- 49 I2 arcmin DEm Declination (J2000) at Epoch 51- 54 F4.1 arcsec DEs Declination (J2000) at Epoch 57- 64 F8.3 yr Epoch DENIS epoch of observation 67- 70 F4.1 mag Bmag ? B magnitude from the SRC-J plate 73- 76 F4.1 mag Rmag ? R magnitude from the plates POSS I, SRC-R and ESO-R 79- 83 F5.2 mag Imag DENIS I magnitude 86- 89 F4.2 mag I-J DENIS I-J colour index 92- 95 F4.2 mag J-K DENIS J-K colour index 98-101 F4.1 mag H(I) I band reduced proper motion (3) 104-106 F3.1 mag e_H(I) ? H(I) error (only in table3c.dat) 108-110 F3.1 mag H(I)max Maximum I band reduced proper motion (4) 113 A1 --- Ref [a] Reference for proper motion a: our measurement
Note (1): J2206227-204706 is previously listed by Gizis et al., 2000AJ....120.1085G. Note (2): LP 793-34 is a companion to HIP 57361 (Cat. I/239) Note (3): Reduced proper motion H(I) for red dwarf candidates, computed from I magnitude and proper motion as: H = m + 5 + 5logµ Note (4): Maximum HI for a M giant star (class III) of the same I-J colour, computed from the (I-J, HImax) relation in the paper
Byte-by-byte Description of file: table5a.dat table5b.dat
Bytes Format Units Label Explanations
1 A1 --- Type [abc] Type of star (G1) 3- 17 A15 --- DENIS DENIS name 18 A1 --- n_DENIS [*] *: low proper motion red dwarf candidates 21- 25 F5.2 mag IMAG Absolute I band magnitude (1) 28- 31 F4.1 pc DistI Estimated distance from IMAG 34- 37 F4.1 km/s Vt Tangential velocity (computed from D and proper motion) 40- 43 I4 K Teff Effective temperature (2) 46- 48 A3 --- Ref Reference for previously known distances (3)
Note (1): Absolute I-band magnitude estimated from the (I-J, absolute magnitude) relation in the paper Note (2): Effective temperature estimated from the (I-J, Teff) relation in the paper Note (3): References are numbered as follows: for a previously known trigonometric parallax: a = Gliese & Jahreiss, 1991, Cat. V/70; for a spectrophotometric distance: b = Kirkpatrick et al., 1997AJ....113.1421K c = Gizis et al., 2000AJ....120.1085G d = Cruz & Reid, 2002, Cat. J/AJ/123/2828 e = McCaughrean et al., 2002A&A...390L..27M; or for a photometric distance: f = Reid & Cruz, 2002, Cat. J/AJ/123/2806
Global notes: Note (G1): Type of stars are designated as follows: a = 24 high proper motions ((pm>0.1"/yr) late-M dwarfs selected in the 3600 square degree b = 15 high proper motions ((pm>0.1"/yr) stars initially selected from the NLTT (I/98) c = 11 low proper motions (pm<0.1"/yr) probable late-M dwarfs found in the 5700 square degrees
Acknowledgements: Phan Bao Ngoc, pbngoc(at)asiaa.sinica.edu.tw References: Delfosse et al., Paper I 1999A&A...344..897D Delfosse et al., Paper II 2001A&A...366L..13D Hambly et al., Paper III 2004A&A...425..997B Phan-Bao et al., Paper IV 2001A&A...380..590P, Cat. J/A+A/380/590
(End) Patricia Vannier [CDS] 01-Mar-2005
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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