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22611. UBV and Radial Velocities of SMC Supergiants
ID:
ivo://CDS.VizieR/J/A+AS/30/261
Title:
UBV and Radial Velocities of SMC Supergiants
Short Name:
J/A+AS/30/261
Date:
21 Oct 2021
Publisher:
CDS
Description:
From observations at the European Southern Observatory, spectrographic and photometric data are presented for 91 supergiant stars belonging to the Small Magellanic Cloud and its Wing. The data include MK classes for 52 stars, radial velocity data for 51 stars and UBV photometry for 90 stars. In V the limiting magnitude for the spectrographic observations is 13.7 and for the photometric observations 13.9. Whenever possible, radial velocities for interstellar CaII and [OII] have been measured and listed. In Remarks to the Catalogue notes are given for the individual stars concerning the obtained data and comparisons with results of previous investigations.
22612. UBV and radial velocity light curves of beta Lyr
ID:
ivo://CDS.VizieR/J/A+A/463/233
Title:
UBV and radial velocity light curves of beta Lyr
Short Name:
J/A+A/463/233
Date:
21 Oct 2021
Publisher:
CDS
Description:
Our goals were to analyse 52 photographic and 651 electronic spectra of beta Lyr to obtain additional information about circumstellar matter and to investigate spectrophotometric information for the first time.
22613. UBV and RV of red giants in NGC 2477
ID:
ivo://CDS.VizieR/J/A+A/423/189
Title:
UBV and RV of red giants in NGC 2477
Short Name:
J/A+A/423/189
Date:
21 Oct 2021
Publisher:
CDS
Description:
New, accurate radial velocities and photoelectric UBV photometry of 83 red-giant candidates in the field of the rich, intermediate-age open cluster NGC 2477 ([Fe/H]=-0.05, age ~1Gyr) are presented and discussed. From 49 constant-velocity members we find a mean cluster velocity of +7.32+/-0.13km/s and confirm the membership of 76 of the stars. Among the cluster members, we identify 26 definite and 1 probable spectroscopic binaries and determine orbits for 13 of these systems, with periods ranging from 40 to 4578 days. The binary frequency is thus rather high (27/76=36%). The observed internal radial velocity dispersion of the cluster, as determined from the single member stars, is 0.93km/s, corrected for the small average observational error of 0.22km/s. Fitting King-type models to the observed stellar density distribution and velocity dispersion, and assuming a distance of 1.25kpc, we find the core and tidal radii of NGC 2477 to be 1.8 and 8.1pc, respectively, and estimate that the mass of cluster stars down to V=17, corresponding to ~1M_{sun}_, is at least 5400 M_{sun}_. The substantial differential reddening of NGC 247 requires a more detailed study before definitive isochrone fits can be made.
22614. UBV and spectroscopic variations of V2368 Oph
ID:
ivo://CDS.VizieR/J/A+A/531/A49
Title:
UBV and spectroscopic variations of V2368 Oph
Short Name:
J/A+A/531/A49
Date:
21 Oct 2021
Publisher:
CDS
Description:
The A-type star HR 6412 = V2368 Oph was used by several investigators as a photometric comparison star for the known eclipsing binary U Oph but was found to be variable by three independent groups, including us. By analysing series of new spectral and photometric observations and a critical compilation of available radial velocities, we were able to find the correct period of light and radial-velocity variations and demonstrate that the object is an eclipsing and double-lined spectroscopic binary moving in a highly eccentric orbit. We derived a linear ephemeris Tmin.I=HJD(2454294.67+/-0.01)+(38.32712+/-0.00004)d*E and estimated preliminary basic physical properties of the binary.
22615. UBV and uvby-beta observations of Orion OB1 Association
ID:
ivo://CDS.VizieR/II/36
Title:
UBV and uvby-beta observations of Orion OB1 Association
Short Name:
II/36
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Catalogue of Individual UBV and uvby-beta Observations of Stars in the Region of the Orion OB 1 Association presents individual UBV observations of 106 stars in the vicinity of the Orion Nebula (the Sword region) and individual uvby-beta observations of 508 stars in all regions of the Orion OB 1 association. For the UBV data the stars are identified by their Brun (1935) numbers, with cross identifications to the chart numbers used in Warren and Hesser (1977); the uvby-beta stars are identified by the aforementioned chart numbers and HD, BD or P (Parenago 1954) numbers in that order of preference. The catalogue contains the data of all observations and is intended to provide data for investigations of variability in the Orion region. See <http://obswww.unige.ch/gcpd/ph01.html> for a full description of the UBV system, and <http://obswww.unige.ch/gcpd/ph04.html> for a description of uvby-beta system.
22616. UBV and uvbyb in zeta Scl cluster
ID:
ivo://CDS.VizieR/J/A+AS/76/101
Title:
UBV and uvbyb in zeta Scl cluster
Short Name:
J/A+AS/76/101
Date:
21 Oct 2021
Publisher:
CDS
Description:
130 stars in the region of the Zeta Sculptoris cluster have been observed photoelectrically, most of them in UBVBeta and about half of them in uvby and a few also in the Cousins' system.
22617. UBV Astrometry and Photometry of doubles
ID:
ivo://CDS.VizieR/J/A+AS/139/69
Title:
UBV Astrometry and Photometry of doubles
Short Name:
J/A+AS/139/69
Date:
21 Oct 2021
Publisher:
CDS
Description:
UBV CCD absolute photometry and differential astrometry of 111 southern visual binaries are presented. Observations have been performed at Las Campanas Observatory (Chile) in 1991-92 at 61-cm telescope. The separation range is 2.5-8arcsec. The mean epoch of the measurements is 1992.0. The photometry (table 1) was calibrated by one night of standard star observations. The positional parameters (table 3) are given in the reference system J2000 and calibrated using Hipparcos and CDS data. An additional table 2 provides the notes on observational circumstances.
22618. UBV-beta Database for LS Stars
ID:
ivo://CDS.VizieR/J/ApJS/115/271
Title:
UBV-beta Database for LS Stars
Short Name:
J/ApJS/115/271
Date:
21 Oct 2021
Publisher:
CDS
Description:
(Excerpt from the "intro.txt" file) Between 1959 and 1971, the Hamburg and Warner and Swasey Observatories published a seven-volume survey listing intrinsically luminous stars (hereafter "LS" objects) - mostly OB stars, as well as a number of A, F, and G supergiants and Wolf-Rayet stars - within about ten degrees of the plane of the Milky Way to a limiting photographic magnitude of approximately 13.5. Based on objective-prism surveys of dispersion 580 Angstrom per millimeter at Hydrogen-gamma, these catalogs have served as starting points for numerous investigations of galactic structure and the characteristics of massive stars. Much fundamental data on the LS stars now exists distributed throughout the astronomical literature. This work describes a compilation of published photoelectric UBV-Beta photometry and spectral classifications nominally on the MK system for the LS stars, as well as an extensive cross-identification table linking LS numbers and other commonly-used identifiers such as HD, BD, CD, CPD and HR numbers. At this writing, the UBV-Beta portion of the database covers both the Northern and Southern LS stars, whereas MK classifications have as yet only been fully compiled for the Southern stars; compilation of MK types for the Northern LS stars is as yet incomplete, but ongoing.
22619. UBV CCD photometry of NGC 1220
ID:
ivo://CDS.VizieR/J/A+A/391/179
Title:
UBV CCD photometry of NGC 1220
Short Name:
J/A+A/391/179
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present UBV CCD observations obtained in the field of the northern open cluster NGC 1220, for which little information is available. We provide also BV CCD photometry of a field 5' northward of NGC 1220 to take into account field star contamination. We argue that NGC 1220 is a young compact open cluster, for which we estimate a core radius in the range 1.5-2.0arcmin. We identify 26 likely candidate members with spectral type earlier than A5, down to V_0_=15.00mag on the basis of the position in the two-colour Diagram and in the Colour Magnitude Diagrams (CMDs). By analyzing the distribution of these stars in the colour-colour and CMDs, we find that NGC 1220 has a reddening E(B-V)=0.70+/-0.15mag, is placed 1800+/-200pc distant from the Sun, and has an age of about 60Myrs. The cluster turns out to be located about 120pc above the Galactic plane, relatively high with respect to its age.
22620. u'BVg'r'i'z' light curves of SN 2008ax
ID:
ivo://CDS.VizieR/J/MNRAS/389/955
Title:
u'BVg'r'i'z' light curves of SN 2008ax
Short Name:
J/MNRAS/389/955
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present spectroscopy and photometry of the He-rich supernova (SN) 2008ax. The early-time spectra show prominent P-Cygni H lines, which decrease with time and disappear completely about 2 months after the explosion. In the same period HeI lines become the most prominent spectral features. SN 2008ax displays the ordinary spectral evolution of a Type IIb supernova. A stringent pre-discovery limit constrains the time of the shock breakout of SN 2008ax to within only a few hours. Its light curve, which peaks in the B band about 20d after the explosion, strongly resembles that of other He-rich core-collapse supernovae. The observed evolution of SN 2008ax is consistent with the explosion of a young Wolf-Rayet (of WNL type) star, which had retained a thin, low-mass shell of its original H envelope. The overall characteristics of SN 2008ax are reminiscent of those of SN 1993J, except for a likely smaller H mass. This may account for the findings that the progenitor of SN 2008ax was a WNL star and not a K supergiant as in the case of SN 1993J, that a prominent early-time peak is missing in the light curve of SN 2008ax, and that H{alpha} is observed at higher velocities in SN 2008ax than in SN 1993J.

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