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J/A+A/481/661    Hyades brown dwarfs and very low mass stars    (Bouvier+, 2008)

Brown dwarfs and very low mass stars in the Hyades cluster: a dynamically evolved mass function. Bouvier J., Kendall T., Meeus G., Testi L., Moraux E., Stauffer J.R., James D., Cuillandre J.-C., Irwin J., McCaughrean M.J., Baraffe I., Bertin E. <Astron. Astrophys., 481, 661-672 (2008)> =2008A&A...481..661B
ADC_Keywords: Clusters, open ; Photometry ; Proper motions Keywords: stars: luminosity function, mass function - stars: low-mass, brown dwarfs - Galaxy: open clusters and associations: individual: Hyades (Melotte 25) Abstract: We conducted a search for brown dwarfs (BDs) and very low mass (VLM) stars in the 625Myr-old Hyades cluster in order to derive the cluster's mass function across the stellar-substellar boundary. We performed a deep (I=23, z=22.5) photometric survey over 16deg2 around the cluster center and followed up with K-band photometry to measure the proper motion of candidate members and with optical and near-IR spectroscopy of probable BD and VLM members. Description: Wide-field optical images were obtained in the I and z bands with the CFHT 12 K camera. The survey was performed during several service observing runs between September 2002 and January 2003, and consists of 53 mosaic fields covering a total of 17.3 square degrees over the cluster area. Follow up K'-band imaging was obtained for 108 of the 125 optically selected candidate members. About half of this sample was observed in Nov/04 and the other half in Nov/05. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 98 22 Probable Hyades members based on photometry and proper motion tabled1.dat 98 103 Hyades probable non-members: candidate members selected from the (I, I-z) CMD but whose infrared colors and/or proper motion is inconsistent with membership
See also: J/AJ/80/379 : Hyades cluster: motion, membership and distance (Hanson+, 1975) J/ApJ/325/798 : Einstein survey of stars in the Hyades (Micela+, 1988) J/A+A/243/386 : Hyades members distances (Schwan 1991) J/A+A/310/879 : Hyades binaries (Barrado+, 1996) J/A+A/331/81 : Hyades membership (Perryman+ 1998) J/AZh/77/96 : Abundances in Hyades red giants (Boyarchuk+, 2000) J/A+A/367/111 : A Hipparcos study of the Hyades cluster (de Bruijne+, 2001) J/other/NewA/8.645 : Vmag/plx relation for Hyades stars (Sharaf+, 2003) J/AJ/127/3579 : Radial velocities of Hyades stars (Paulson+, 2004) J/AJ/132/111 : BV(RI)Cphotometry of 77 Hyades stars (Joner+, 2006) Byte-by-byte Description of file: table1.dat tabled1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- --- [CFHT-Hy-] 9- 10 I2 --- CFHT ? CFHT-Hy designation (table1 only) Cl* Melotte 25 CFHT NN in Simbad 12 A1 --- n_CFHT [1-7] Note on CFHT (1) 14- 26 A13 --- [BKM2008] Internal number 28 A1 --- n_[BKM2008] [1-7 a-c] Note on [BKM2008] (1) 31 I1 h RAh Right ascension (J2000) 33- 34 I2 min RAm Right ascension (J2000) 36- 39 F4.1 s RAs Right ascension (J2000) 41 A1 --- DE- Declination sign (J2000) 42- 43 I2 deg DEd Declination (J2000) 45- 46 I2 arcmin DEm Declination (J2000) 48- 49 I2 arcsec DEs Declination (J2000) 51- 55 F5.2 mag Imag I (822nm) magnitude 57- 60 F4.2 mag I-z I-z colour index 62- 65 F4.2 mag I-K ? I-K colour index 67- 70 I4 mas/yr pmRA ? Proper motion along RA, pmRA*cosDE 72- 75 I4 mas/yr pmDE ? Proper motion along DE 77- 98 A22 --- Oname Other name(s) (2)
Note (1): Notes as follows: 1 = A faint companion is seen 3.2" away from this Hyades probable member but its I-K color and proper motion indicates a background star 2 = Classified as a non member by Reid (1993MNRAS.265..785R). Spectroscopically confirmed as a non-member in this study (see text) 3 = Classified as a non member by Reid (1993MNRAS.265..785R). Spectroscopically confirmed as a member in this study (see text) 4 = CFHT-Hy-15 and 17 form a visual pair (RHy 240 AB) 5 = Classified as a non member by Gizis et al. (1999AJ....118..997G), see text 6 = This probable Hyades BD was also observed in the J and H bands, yielding (J-H, H-K)=(0.51, 0.43) 7 = This probable Hyades BD was also observed in the J and H bands, yielding (J-H, H-K)=(1.12, 0.77) a = This candidate has a proper motion consistent with membership but is too blue in I-K to be a cluster member b = This candidate has candidate has no follow up K-band photometry c = This extremely red object was also observed in the J and H bands, yielding (J-H, H-K)=(2.24, 0.91) Note (2): Other names are from: VA = van Altena (1969AJ.....74....2V), Cl* Melotte 25 VA NNN in Simbad LP = Luyten et al. (1981, Cat. I/98) HAN = Hanson (1975AJ.....80..379H), Cl* Melotte 25 Han NNN in Simbad RHy = Reid (1992MNRAS.257..257R), Cl* Melotte 25 REID NNN in Simbad LH = Leggett & Hawkins (1988MNRAS.234.1065L), Cl* Melotte 25 LH NNN in Simbad LHD = Leggett et al. (1994AJ....108..944L) 2MASS = Gizis et al. (1999AJ....118..997G)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Jun-2008
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