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J/PASP/118/659    RI photometry of 2MASS late M and L dwarfs    (Liebert+, 2006)

RI photometry of 2MASS-selected late M and L dwarfs. Liebert J., Gizis J.E. <Publ. Astron. Soc. Pac., 118, 659-670 (2006)> =2006PASP..118..659L
ADC_Keywords: Stars, dwarfs ; Stars, late-type ; Photometry, infrared Abstract: We report R and I band observations for 201 late M and L dwarfs selected on the basis of Two Micron All Sky Survey (Cat. II/246) JHKs and photographic red colors, made with a telescope of modest aperture. It is shown that deep surveys covering these red bands can provide data sets that complement JHKs, permitting a fairly good photometric classification system for L dwarfs. Due primarily to the disappearance of strong TiO opacities, R-I reaches a maximum at late M type and turns blueward for subtypes M9 to about L3. Apart from a small plateau at L0-L2, the I-Ks color remains as a monotonic measure of spectral type or temperature over this range, and likewise for M dwarfs. For late L types, both colors probably get redder again, although the accuracy of our data and number of objects do not give us robust conclusions by L6-L8. It is also interesting to look at the dispersions of the IJKs bands at a given spectral type. It is widely believed that this dispersion is caused by object-to-object variations in the amount, location, or other properties of dust or clouds. We find a moderately larger spread for the J-Ks color than for I-J. Description: Observations were obtained using the Cassegrainfocus CCD imager at the Cerro Tololo InterAmerican Observatory (CTIO) 1.5m telescope. Observing runs were in 1999 March, May, and September and 2000 May. Observations were made with the Kron-Cousins R and I filters. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 84 201 *Observed Sample
Note on table1.dat: On the 204 lines of the original version, they were 3 duplicated lines, removed here.
See also: J/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003) J/AJ/132/891 : Binaries among nearby L dwarfs (Reid+, 2006) J/AJ/133/439 : Luminosity function of M7-L8 ultracool dwarfs (Cruz+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension (J2000) 4- 5 I2 min RAm Right ascension (J2000) 7- 11 F5.2 s RAs Right ascension (J2000) 13 A1 --- DE- Declination sign (J2000) 14- 15 I2 deg DEd Declination (J2000) 17- 18 I2 arcmin DEm Declination (J2000) 20- 23 F4.1 arcsec DEs Declination (J2000) 25- 30 F6.3 mag Rcmag ?=- Cousins R magnitude 32- 36 F5.3 mag e_Rcmag ?=- rms uncertainty on Rcmag 38- 43 F6.3 mag Icmag ?=- Cousins I magnitude 45- 49 F5.3 mag e_Icmag ?=- rms uncertainty on Icmag 51- 55 F5.3 mag Rc-Ic ? Cousins R-I colour index 57- 61 F5.2 mag Jmag 2MASS J magnitude 63- 67 F5.2 mag Hmag 2MASS H magnitude 69- 73 F5.2 mag Ks 2MASS Ks magnitude 75- 78 A4 --- SpType MK spectral type 80- 82 F3.1 --- e_SpType ? Error on SpType 84 I1 --- r_SpType ? Reference for SpType (1)
Note (1): References as follows: 1 = Cruz et al., 2007, Cat. J/AJ/133/439 and Cruz, 2004ApJ...604L..61C 2 = Cruz et al., 2003, Cat. J/AJ/126/2421 3 = Reid et al., 2006, Cat. J/AJ/132/891 4 = Reid & Cruz, 2002AJ....123..466R 5 = Kirkpatrick et al., 1999ApJ...519..802K 6 = Kirkpatrick et al., 2000AJ....120..447K 7 = this paper
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Dec-2007
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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