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J/AJ/122/248          h and chi Per UBVI,Hα photometry     (Keller+, 2001)

UBVI and Hα photometry of the h and χ Persei cluster. Keller S.C., Grebel E.K., Miller G.J., Yoss K.M. <Astron. J. 122, 248 (2001)> =2001AJ....122..248K
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, H-alpha ; Stars, Be Keywords: open clusters and associations: individual (NGC 869, NGC 884) - stars: emission-line, Be - stars: evolution - techniques: photometric Abstract: UBVI and Hα photometry is presented for 17319 stars in vicinity of the young double cluster h and χ Persei. Our photometry extends over a 37'x1° field centered on the association. We construct reddening contours within the imaged field. We find that the two clusters share a common distance modulus of 11.75±0.05 and ages of log[age(yr)]=7.1±0.1. From the V-Hα color, a measure of the Hα emission strength, we conduct a survey for emission line objects within the association. We detect a sample of 33 Be stars, eight of which are new detections. We present a scenario of evolutionary enhancement of the Be phenomenon to account for the peak in Be fraction toward the top of the main sequence in the population of h and χ Persei and similar young clusters. UBVI and Hα photometry was performed on five nights between 1999 August 17 and 25 at the San Diego State University Mount Laguna Observatory with the 1m telescope and a Loral 2048x2048 CCD. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 02 22 24 +57 07.0 NGC 884 02 19 00 +57 09.0 NGC 869 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 100 5 Atmospheric extinction coefficients and photometric zero points from the present study table2.dat 74 17315 Photometric data table4.dat 74 33 Be stars detected within the field of h and χ Per
See also: J/A+A/372/477 : ubvyβ photometry of h + chi Persei (Marco+, 2001) J/A+AS/119/271 : Be stars uvbyβ photometry (Fabregat+, 1996) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY/MM/DD" Date Observation date 12- 16 F5.3 mag k1,V Atmospheric extinction coefficient in V band 18- 22 F5.3 mag e_k1,V rms uncertainty on k1,V 24- 28 F5.3 mag k1,B Atmospheric extinction coefficient in B band 30- 34 F5.3 mag e_k1,B rms uncertainty on k1,B 36- 39 F4.2 mag k1,U Atmospheric extinction coefficient in U band 41- 44 F4.2 mag e_k1,U rms uncertainty on k1,U 46- 50 F5.3 mag K1,I Atmospheric extinction coefficient in I band 52- 56 F5.3 mag e_K1,I rms uncertainty on k1,I 58- 62 F5.3 mag ksiV Photometric zero point in V band 64- 68 F5.3 mag e_ksiV rms uncertainty on ksiV 70- 74 F5.3 mag ksiB Photometric zero point in B band 76- 80 F5.3 mag e_ksiB rms uncertainty on ksiB 82- 85 F4.2 mag ksiU Photometric zero point in U band 87- 90 F4.2 mag e_ksiU rms uncertainty on ksiU 92- 96 F5.3 mag ksiI Photometric zero point in I band 97-100 F4.2 mag e_ksiI rms uncertainty on ksiI
Byte-by-byte Description of file: table2.dat table4.dat
Bytes Format Units Label Explanations
1- 5 I5 --- [KGM2001] Identification number 7- 15 F9.3 pix Xpix X pixel position (1) 17- 25 F9.3 pix Ypix Y pixel position (1) 28- 33 F6.3 mag Vmag The V-band magnitude 36- 41 F6.3 mag U-B The U-B color 44- 49 F6.3 mag B-V The B-V color 52- 57 F6.3 mag V-I The V-I color 60- 65 F6.3 mag V-Ha The V-Hα color 67- 68 A2 --- Be [Be] Be: Be star 71- 74 I4 --- Oos ? The Oosterhoff (1937AnLei..17a...1O) identification number (2)
Note (1): The scale is 1 pix = 0.399" Note (2): Identifications: NGC 869 NNNN (for Nos 1-1640, 4000-4090), h Per NGC 884 NNNN (for Nos 1641-2987, 7001-7125), chi Per
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 14-Jan-2002
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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