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J/A+A/441/653       32 DENIS nearby red dwarfs                    (Crifo+, 2005)

New neighbours. VI. Spectroscopy of DENIS nearby stars candidates. Crifo F., Phan-Bao N., Delfosse X., Forveille T., Guibert J., Martin E.L., Reyle C. <Astron. Astrophys., 441, 653-661 (2005)> =2005A&A...441..653C
ADC_Keywords: Stars, nearby ; Stars, dwarfs ; Photometry, infrared ; MK spectral classification ; Stars, distances Keywords: stars: very low mass, brown dwarfs Abstract: We present spectra of 36 nearby star candidates and 3 red giant candidates, identified in the DENIS database. 32 of the dwarf candidates are nearby red dwarfs, with spectral types from M5.5 to M8.5. Out of 11 targets with low proper motion (mu<0.1arcsec/yr) but a Reduced Proper Motion above an inclusive threshold, 9 are red dwarfs. The 4 contaminants are all reddened F-K main sequence stars, and could have been eliminated by checking for small well-known high latitude molecular clouds. These stars might be of interest as probes of interstellar absorption. For the red dwarfs we derive spectral types and spectroscopic distances, using a new calibration of the PC3 spectral index to absolute magnitudes in the I, J, H and K photometric bands. We confirm 2 new members of the 12 pc volume (2 new M8.5), and one M7.5 NLTT object closer than 10pc; and show that one quarter of the stars with photometric distances under 30pc have too small a proper motion for inclusion in the NLTT catalog. Description: 27 of the stars were observed with the Boller & Chivens spectrograph mounted on the ESO 1.52m telescope at La Silla on August 4th, 5th and 6th 2002. 12 mostly fainter stars were observed at the NTT telescope in November 2003, using the EMMI instrument in its Red Imaging and Low-Dispersion mode (RILD). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 111 32 Spectral indices table3.dat 118 32 Spectroscopic distances and spectral types
See also: B/denis : The DENIS database (Epchtein+, 1999) I/98 : NLTT Catalogue (Luyten, 1979) I/87 : LHS Catalogue, 2nd Edition (Luyten 1979) V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991) J/A+AS/105/179 : New proper-motion stars Dec←40, 16<RA<24h (Wroblewski+ 1994) J/A+A/380/590 : 30 DENIS late-M dwarfs between 15 and 30pc (Phan-Bao+, 2001) J/A+A/401/959 : 35 DENIS late-M dwarfs between 10 and 30pc (Phan-Bao+, 2003) J/A+A/446/515 : Distances of nearby ultracool dwarfs (Phan-Bao+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 A15 --- DENIS The DENIS name 19- 28 A10 --- OName ? Other name (1) 32- 35 F4.2 --- PC3 The PC3 spectral index (2) 39- 43 F5.3 --- TiO5 The TiO5 spectral index (3) 44 A1 --- u_TiO5 [:] Unreliable value 48- 52 F5.3 --- CaH2 The CaH2 spectral index (3) 53 A1 --- u_CaH2 [:] Unreliable value 57- 61 F5.3 --- CaH3 The CaH3 spectral index (3) 62 A1 --- u_CaH3 [:] Unreliable value 66- 70 F5.3 --- VO1 The VO1 spectral index (4) 74- 78 F5.3 --- VO2 The VO2 spectral index (5) 82- 86 F5.3 --- TiO6 The TiO6 spectral index (5) 90- 94 F5.3 --- TiO7 The TiO7 spectral index (5) 98-101 A4 --- SptPC3 Spectral type derived from the PC3 index (6) 105-108 A4 --- SptTiO5 Spectral type derived from the TiO5 index (7) 109 A1 --- u_SptTiO5 [:] Unreliable value 111 A1 --- Pr [ABb] Priority code (8)
Note (1): Other names from Luyten catalogues (Cat. I/98, <I/87.), Nearby Stars (Preliminary 3rd Version, Cat. V/70) or Wroblewski & Torres 1994 (Cat. J/A+AS/105/179) when available Note (2): Spectroscopic index defined in Martin et al. (1999AJ....118.2466M) Note (3): Spectroscopic indices defined in Reid et al. (1995AJ....110.1838R) Note (4): Spectroscopic index defined in Hawley et al. (2002AJ....123.3409H) Note (5): Spectroscopic indices defined in Lepine et al. (2003AJ....125.1598L) Note (6): Using the formula given in Martin et al. (1999AJ....118.2466M) Note (7): Using the formula given in Cruz & Reid (2002AJ....123.2828C) Note (8): Priority group as follows: A = red dwarf candidates with low proper motion (<0.1arcsec/yr) B = red dwarf candidates with high proper motion (>0.1arcsec/yr) belong to the main sample selected from the DENIS database b = red dwarf candidates with high proper motion (>0.1arcsec/yr) belong to the extended sample selected from the NLTT/LHS catalog
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 15 A15 --- DENIS The DENIS name 16 A1 --- n_DENIS [a] Note (1) 19- 23 F5.2 mag Imag DENIS I-band magnitude 27- 30 F4.2 mag I-J DENIS I-J colour index 34- 37 F4.2 mag J-K DENIS J-K colour index 41- 44 F4.2 --- PC3 PC3 spectral index (2) 48- 52 F5.2 mag IMAGI-J Absolute I-band magnitude from I-J colour (3) 56- 60 F5.2 mag IMAGPC3 Absolute I-band magnitude from PC3 index (4) 64- 68 F5.2 mag JMAGPC3 Absolute J-band magnitude from PC3 index (4) 72- 76 F5.2 mag KMAGPC3 Absolute K-band magnitude from PC3 index (4) 80- 83 F4.1 pc Dist(I) Estimated distance from IMAGPC3 87- 90 F4.1 pc Dist(J) Estimated distance from JMAGPC3 94- 97 F4.1 pc Dist(K) Estimated distance from KMAGPC3 101-104 F4.1 pc Dist Adopted distance based on Dist(I), Dist(J) and Dist(K) 108-111 F4.1 pc Dist(I-J) Distance derived from the I-J colour 115-118 A4 --- SpType Adopted MK spectral type
Note (1): a: also discussed in Cruz & Reid 2002 (2002AJ....123.2828C) Note (2): Spectroscopic index defined in Martin et al. (1999AJ....118.2466M) Note (3): Using the formula given in Phan-Bao et al. (2003A&A...401..959P) Note (4): Estimated from the PC3-absolute magnitudes relation given in the paper
Acknowledgements: Phan-Bao Ngoc, pngoc(at)physics.ucf.edu References: Delfosse et al., Paper I 1999A&A...344..897D Delfosse et al., Paper II 2001A&A...366L..13D Beuzit et al., Paper III 2004A&A...425..997B Phan-Bao et al., Paper IV 2001A&A...380..590P, Cat. J/A+A/380/590 Phan-Bao et al., Paper V 2003A&A...401..959P, Cat. J/A+A/401/959
(End) Patricia Vannier [CDS] 17-Mar-2006
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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