J/A+A/371/908 Havlen-Moffat No. 1 UBVRI photometry (Vazquez+, 2001)
The open cluster Havlen-Mofat No. 1 revisited
Vazquez R.A., Baume G.
<Astron. Astrophys. 371, 908 (2001)>
=2001A&A...371..908V 2001A&A...371..908V
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; MK spectral classification
Keywords: cluster: open - individual: Havlen-Mofat No. 1 - stars: imaging -
stars: luminosity function, mass function - ISM: dust, extinction
Description:
A deep CCD UBVRI photometric survey combined with UBVRI polarimetric
observations of 21 bright stars was carried out in the region of the
open cluster Havlen-Moffat No. 1. Our data reveal that the extinction
law in this cluster es variable and that six cluster stars show very
high polarisation values (>4%), probably because of the presence of a
nearby small dust cloud.
The cluster is at a distance of d=3300pc, it is 2-4Myr old and the
initial mass function of its most massive stars (M>3M☉) has a flat
slope of x about of 0.7. As an additional result, it was possible to
reconcile the absolute magnitudes of the two WN7-type members using
the R-values valid in the regions where they are located.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 49 15 Star positions (from Simbad)
table1.dat 95 802 Photometric catalogue of the HM1 region
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- Seq Sequence number
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 16 F4.1 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 26 I2 arcsec DEs Declination (J2000)
30- 31 I2 --- HM1 Identification number in Havlen & Moffat,
1977A&A....58..351H 1977A&A....58..351H (Cl HM 1 NN)
33- 36 I4 --- LSS ? Stephenson & Sanduleak, Cat. III/43, number
38- 48 A11 --- Name Other name
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- Seq Sequence number
7- 9 I3 --- HM1 ? Identification number of Havlen & Moffat,
1977A&A....58..351H 1977A&A....58..351H and The et al.,
1982ApL....22..109T 1982ApL....22..109T (Cl HM 1 NNN in Simbad)
12- 17 F6.1 pix Xpos X position (1)
20- 25 F6.1 pix Ypos Y position (1)
29- 33 F5.2 mag Vmag ? V magnitude
35- 36 A2 --- u_Vmag [: ] uncertainty flag on Vmag (2)
38- 42 F5.2 mag B-V B-V color
44- 45 A2 --- u_B-V [: ] uncertainty flag on B-V (2)
47- 51 F5.2 mag U-B []? U-B color
53- 54 A2 --- u_U-B [: ] uncertainty flag on U-B (2)
56- 60 F5.2 mag V-R []? V-R color
62- 63 A2 --- u_V-R [: ] uncertainty flag on V-R (2)
65- 69 F5.2 mag V-I []? V-I color
71- 72 A2 --- u_V-I [: ] uncertainty flag on V-I (2)
74- 77 I4 --- LSS ? LSS number
82- 86 A5 --- SpType Spectral Type
89- 91 A3 --- r_SpType Spectral Type source (3)
95 A1 --- Note [*] Note (4)
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Note (1): Origin: X, Y = 0.00; 0.00 ⟹ RA=17:19:36 (2000) DE=-38:51:49
Orientation: ascending Y --> North
ascending X --> West
Scale: 1 pixel = 0.45 arcsec
Note (2): (:) errors larger than 0.04mag
(::) errors larger than 0.08mag
Note (3): the source are
1 for spectral type from Havlen & Moffat, 1977A&A....58..351H 1977A&A....58..351H
2 for spectral type from Walborn & Fitzpatrick (2000PASP..112...50W 2000PASP..112...50W)
Note (4): the * indicates stars that has a companion star
- star 2 companion is star (14) at 4".
Integrated V = 11.16 in coincidence with Havlen & Moffat,
1977A&A....58..351H 1977A&A....58..351H
- star 10 companion is star (87) at 3.9".
Integrated V = 13.61 against 13.64 from Havlen & Moffat,
1977A&A....58..351H 1977A&A....58..351H
- star 22 companion is star (102) at 7.8".
Integrated V = 14.57 against 14.58 from Havlen & Moffat,
1977A&A....58..351H 1977A&A....58..351H
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Acknowledgements: Ruben Vazquez
(End) Patricia Bauer [CDS] 09-May-2001