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. =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_{sun}_) 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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file stars.dat 49 15 Star positions (from Simbad) table1.dat 95 802 Photometric catalogue of the HM1 region -------------------------------------------------------------------------------- Byte-by-byte Description of file: stars.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 Identificaiton number in Havlen & Moffat, 1977A&A....58..351H (Cl HM 1 NN) 33- 36 I4 --- LSS ? Stephenson & Sanduleak, Cat. , number 38- 48 A11 --- Name Other name -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 2- 4 I3 --- Seq Sequence number 7- 9 I3 --- HM1 ? Identification number of Havlen & Moffat, 1977A&A....58..351H and The et al., 1982ApL....22..109T (Cl HM 1 NNN in Simbad) 12- 17 F6.1 pix Xpos X position 20- 25 F6.1 pix Ypos Y position 29- 33 F5.2 mag Vmag ? V magnitude 35- 36 A2 --- u_Vmag [: ] uncertainty flag on Vmag (1) 38- 42 F5.2 mag B-V B-V color 44- 45 A2 --- u_B-V [: ] uncertainty flag on B-V (1) 47- 51 F5.2 mag U-B []? U-B color 53- 54 A2 --- u_U-B [: ] uncertainty flag on U-B (1) 56- 60 F5.2 mag V-R []? V-R color 62- 63 A2 --- u_V-R [: ] uncertainty flag on V-R (1) 65- 69 F5.2 mag V-I []? V-I color 71- 72 A2 --- u_V-I [: ] uncertainty flag on V-I (1) 74- 77 I4 --- LSS ? LSS number 82- 86 A5 --- SpType Spectral Type 89- 91 A3 --- r_SpType Spectral Type source (2) 95 A1 --- Note [*] Note (3) -------------------------------------------------------------------------------- Note (1): (:) errors larger than 0.04mag (::) errors larger than 0.08mag Note (2): the source are 1 for spectral type from Havlen & Moffat, 1977A&A....58..351H 2 for spectral type from Walborn & Fitzpatrick (2000PASP..112...50W) Note (3): 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 - star 10 companion is star (87) at 3.9". Integrated V = 13.61 against 13.64 from Havlen & Moffat, 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 -------------------------------------------------------------------------------- Acknowledgements: Ruben Vazquez ================================================================================ (End) Patricia Bauer [CDS] 09-May-2001