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J/A+A/395/813   Alpha Per faint stars photometry    (Barrado y Navascues+, 2002)

A substellar mass function for Alpha Persei. Barrado y Navascues D., Bouvier J., Stauffer J.R., Lodieu N., McCaughrean M.J. <Astron. Astrophys. 395, 813 (2002)> =2002A&A...395..813B
ADC_Keywords: Clusters, open ; Stars, faint ; Photometry, infrared ; Photometry, Cousins Keywords: open clusters and associations: individual: Alpha Per - stars: low-mass, brown dwarfs - stars: luminosity, mass functions Abstract: We present a deep, wide-field optical survey of the young stellar cluster Alpha Per, in which we have discovered a large population of candidate brown dwarfs. Subsequent infrared photometric follow-up shows that the majority of them are probable or possible members of the cluster, reaching to a minimum mass of 0.035M. Description: We obtained deep optical imaging of the Alpha Per open cluster using the KPNO 4-m CCD mosaic camera, MOSA, on November 19-22 1998. All of the images were obtained with the facility R and I filters. In addition to the KPNO/MOSA observations, we undertook several infrared observing campaigns at the Hispano-German Calar Alto Observatory in order to obtain additional data for candidate cluster members. These runs included November 22-23 1999, using Omega-Cass on the 3.5-m telescope; February 16-21 2001 and November 6-7 2001, using MAGIC on the 2.2-m telescope; and December 11-14 2000 and December 28-31 2001 using Omega-Prime on the 3.5-m telescope. We observed a total of 53 Alpha Per candidates in the magnitude range K'=13.0-19.2mag, equivalent to Ic=15.7-21.7mag. All were observed in the K' filter, while 24 were also measured at J, and a handful also at H. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 142 101 Alpha Per data from KPNO/MOSA 1998. Probable members, possible members, probable non-members, and no IR data.
See also: B/2mass : The 2MASS database (IPAC/UMass, 2000) V/80 : Low-Mass Stars' Membership in Alpha Per Cluster (Prosser, 1992) J/AN/319/201 : Alpha Per cluster low-mass members. I. (Prosser+, 1998) J/AN/319/215 : Alpha Per cluster low-mass members. II. (Prosser+, 1998) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [AP] 3- 5 I3 --- AP AP designation (APNNN), Cl* Melotte 20 AP NNN in Simbad 7 I1 h RAh Right ascension (J2000.0) 9- 10 I2 min RAm Right ascension (J2000.0) 12- 16 F5.2 s RAs Right ascension (J2000.0) 18 A1 --- DE- Declination sign (J2000.0) 19- 20 I2 deg DEd Declination (J2000.0) 22- 23 I2 arcmin DEm Declination (J2000.0) 25- 28 F4.1 arcsec DEs Declination (J2000.0) 30- 35 F6.3 mag Ic KPNO/MOSA Cousins I magnitude 37- 41 F5.3 mag Rc-Ic KPNO/MOSA Cousins Rc-Ic colour index 43- 47 F5.3 mag e_Ic rms uncertainty on Ic 49- 53 F5.3 mag e_Rc-Ic rms uncertainty on Rc-Ic 55 A1 --- l_Jmag Limit flag on Jmag 56- 61 F6.3 mag Jmag ? 2MASS J magnitude 63- 67 F5.3 mag e_Jmag ? rms uncertainty on Jmag 69 A1 --- l_Hmag Limit flag on Hmag 70- 75 F6.3 mag Hmag ? 2MASS H magnitude 77- 81 F5.3 mag e_Hmag ? rms uncertainty on Hmag 83 A1 --- l_Ksmag Limit flag on Ksmag 84- 89 F6.3 mag Ksmag ? 2MASS Ks magnitude 91- 95 F5.3 mag e_Ksmag ? rms uncertainty on Ksmag 97 A1 --- l_Jmag2 Limit flag on Jmag2 98-103 F6.3 mag Jmag2 ? CAHA J magnitude 105-109 F5.3 mag e_Jmag2 ? rms uncertainty on Jmag2 111 A1 --- l_K'mag Limit flag on K'mag 112-117 F6.3 mag K'mag ? CAHA K' magnitude 119-123 F5.3 mag e_K'mag ? rms uncertainty on K'mag 125-130 F6.3 mag Hmag2 ? CAHA H magnitude 132-136 F5.3 mag e_Hmag2 ? rms uncertainty on Hmag2 138 A1 --- Source Observation date code (1) 140-141 A2 --- Member [Y? N] Membership
Note (1): Observation dates: a = 1999 November b = 2000 February c = 2000 December d = 2001 November e = 2001 December
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 20-Jan-2003
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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