J/A+A/394/479 uvbyβ photometry of h and chi Per (Capilla+, 2002)
CCD uvbyβ photometry of young open clusters.
I. The double cluster h and χ Persei.
Capilla, G., Fabregat J.
<Astron. Astrophys. 394, 479 (2002)>
=2002A&A...394..479C 2002A&A...394..479C
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, H-beta ;
Photometry, uvby ; Stars, B-type
Keywords: techniques: photometric - stars: early-type -
open clusters and associations: individual: NGC 869, NGC 884
Description:
We present CCD uvbyβ photometry for stars in the nuclei of the
young double cluster {h} and χ Persei. We find that the reddening
is highly variable through the {h} Per nucleus, increasing from west
to east, with values ranging from E(b-y)=0.328±0.022 in the western
part to E(b-y)=0.465±0.025 in the south-east. Towards χ Persei
the reddening is fairly constant, with E(b-y)=0.398±0.025. Both
clusters share a common distance modulus of 11.7±0.1mag, and an age
of logt=7.10±0.05 years.
Objects:
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RA (2000) DE Designations (File)
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02 19 05 +57 08 08 {h} Persei = NGC 869 (table6.dat)
02 22 01 +57 08 42 χ Persei = NGC 884 (table7.dat)
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Nomenclature Notes:
The cluster star numbering system is adopted from the WEBDA database
(http://obswww.unige.ch/webda). Numbers lower than 3000 coincide with
Oosterhoff (1937, Ann. Sterrewatch Leiden 17, 1) numbering.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 110 252 Coordinates and photometry for stars in h Per
table7.dat 110 271 Coordinates and photometry for stars in chi Per
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See also:
V/27 : Proper Motions and UBV Photometry in h+chi Per (Muminov 1980)
J/A+A/394/47 : uvbyβ photometry of h and chi Per (Capilla+, 2002)
J/AJ/122/248 : h and chi Per UBVI,Hα photometry (Keller+, 2001)
J/ApJ/576/880 : CCD UBV photometry of h and χ Per (Slesnick+, 2002)
J/PASP/114/233 : h and χ Per memberships (Uribe+, 2002)
J/A+AS/119/271 : Be stars uvbyβ photometry (Fabregat+, 1996)
Byte-by-byte Description of file: table6.dat table7.dat
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Bytes Format Units Label Explanations
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2- 5 I4 --- Star Star number
8- 9 I2 h RAh Right Ascension J2000 (hours)
11- 12 I2 min RAm Right Ascension J2000 (minutes)
14- 18 F5.2 s RAs Right Ascension J2000 (seconds)
20 A1 --- DE- Declination J2000 (sign)
21- 22 I2 deg DEd Declination J2000 (degrees)
24- 25 I2 arcmin DEm Declination J2000 (minutes)
27- 30 F4.1 arcsec DEs Declination J2000 (seconds)
35- 40 F6.3 mag Vmag V magnitude
42- 47 F6.3 mag b-y b-y color index
49- 54 F6.3 mag m1 m1 index
56- 61 F6.3 mag c1 c1 index
63- 68 F6.3 mag Hbeta ?=99.999 beta index (1)
71- 76 F6.3 mag e_Vmag ?=99.999 rms uncertainty on Vmag (1)
78- 83 F6.3 mag e_b-y ?=99.999 rms uncertainty on b-y (1)
85- 90 F6.3 mag e_m1 ?=99.999 rms uncertainty on m1 (1)
92- 97 F6.3 mag e_c1 ?=99.999 rms uncertainty on c1 (1)
99-104 F6.3 mag e_Hbeta ?=99.999 rms uncertainty on Hbeta (1)
107 I1 --- o_Vmag Number of measurements
110 I1 --- Member [0,1] Membership (0: nonmember, 1: member)
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Note (1): 99.999 in any field indicates that no data is available.
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Acknowledgements: Juan Fabregat
(End) Juan Fabregat 20-Aug-2002