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J/ApJ/669/L33    Hα emission sources in h and χ Per  (Currie+, 2007)

Discovery of gas accretion onto stars in 13 Myr old h and χ Persei. Currie T., Kenyon S.J., Balog Z., Bragg A., Tokarz S. <Astrophys. J., 669, L33-L36 (2007)> =2007ApJ...669L..33C
ADC_Keywords: Clusters, open ; Infrared sources ; Accretion ; Photometry, infrared Keywords: accretion, accretion disks - open clusters and associations: individual (NGC 869, NGC 884) - planetary systems: protoplanetary disks Abstract: We report the discovery of accretion disks associated with ∼13Myr old intermediate/low-mass stars in h and χ Persei. Optical spectroscopy of ∼5000 stars in these clusters and a surrounding halo population reveal 32 A-K stars with Halpha emission. Matching these stars with 2MASS and optical photometry yields 25 stars with the highest probability of cluster membership and EW(Halpha)≥5Å. Sixteen of these sources have EW(Halpha)≥10Å. Description: We obtained Hectospec spectra of 4536 sources with V∼16-19, J∼14.25-16.25, and J-H∼0-1.5 in χ Persei and the halo population surrounding both clusters on the 6.5m MMT telescope at Whipple Observatory during 2006 September and November. We acquired additional spectra of 710 sources near h and χ Per with the Hydra multifiber spectrograph on the WIYN 3.5m telescope at the Kitt Peak National Observatory. Hydra spectra were obtained during two observing runs in 2000 November and 2001 October, and include stars with V∼14-17 and J∼12-14.5 (S/N∼10-30 typically). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 66 30 Hα emission sources
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 I1 h RAh Hour of Right Ascension (J2000) (1) 3- 4 I2 min RAm Minute of Right Ascension (J2000) (1) 6- 10 F5.2 s RAs Second of Right Ascension (J2000) (1) 11 A1 --- DE- Sign Declination (J2000) (1) 12- 13 I2 deg DEd Degree of Declination (J2000) (1) 15- 16 I2 arcmin DEm Arcminute of Declination (J2000) (1) 18- 21 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1) 23- 26 A4 --- SpType Spectral type 28- 31 F4.2 --- e_SpType 1σ error in the subclass of SpType 33- 37 F5.2 0.1nm EWHa Halpha equivalent width in Angstroms (2) 39 A1 --- Acc? [yn] Accreting? 41- 46 F6.3 mag Jmag 2MASS J band magnitude (3) 48- 53 F6.3 mag Kmag 2MASS K_s_ band magnitude (3) 55- 59 F5.3 mag K-3.6 ? The (2MASS K_s_- IRAC 3.6 micron) color (3) 61- 66 F6.3 mag K-8 ? The (2MASS K_s_- IRAC 8 micron) color (3)
Note (1): Sources identified as [CKB2007] JHHMMSS.ss+DDMMSS.s in Simbad Note (2): Accreting sources have a Hα equivalent width ≥5Å. All sources but the final entry are from Hectospec. Uncertainties were ∼1-2Å. Note (3): All photometric measurements listed are 5σ detections. Sources were typically brighter than the 10σ limit in J (15.7) and Ks (14.8). See Currie et al. (2007, Cat. J/ApJ/659/599) for typical the error distributions in each band.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 13-Jan-2010
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