- ID:
- ivo://CDS.VizieR/J/PAZh/35/846
- Title:
- 2000-2008 UBV observations of HD 179821
- Short Name:
- J/PAZh/35/846
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new results of our UBV photometry for HD 179821=V1427 Aql, an F supergiant with an infrared excess, from 2000 to 2008. The semiregular low-amplitude ({Delta}=0.05-0.20mag) photometric variability of the star with a cycle period from 130 to 200 days is caused by pulsations, along with the instability of a variable stellar wind. V1427 Aql also exhibits a long-term trend in the brightness and colors that is probably attributable to a change in the stellar temperature as a result of mass loss episodes, which cause variations in the continuum formation level. We present the results of our JHKLM photometry for V1427 Aql in 1992-2008.
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- ID:
- ivo://CDS.VizieR/J/PAZh/26/705
- Title:
- UBV observations of post-AGB supergiants
- Short Name:
- J/PAZh/26/705
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Systematic UBV observations of six variable post-AGB supergiants in 1991-1999 are presented.
- ID:
- ivo://CDS.VizieR/J/PASP/108/338
- Title:
- UBV obs. of the contact binary BF Pavonis
- Short Name:
- J/PASP/108/338
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present UBV photoelectric observations of the W UMa star BF Pav obtained between 1987 and 1993. A time-of-minimum study allows detection of a likely period increase of about 0.015s/yr. The Wilson-Devinney code is employed to simultaneously model the B and V light curves for several fixed values of the mass ratio q. From the quality-of-fit of the different solutions an approximate value of q=1.4+/-0.2 is derived. Absolute values of masses, dimensions, and luminosities are estimated by means of standard mass-luminosity relations for main-sequence stars. The detected period variation determines a lower limit of 5x10^-7M_{sun}_/yr for the rate of mass transfer from the less-massive to the more-massive component. We speculate that BF Pav has recently become in contact and is now in a rapid phase of mass transfer.
- ID:
- ivo://CDS.VizieR/J/PAZh/33/679
- Title:
- UBV phot. and equivalent widths of V886 Her
- Short Name:
- J/PAZh/33/679
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present our long-term photometric and spectroscopic observations of a high-latitude B supergiant with an infrared excess - the protoplanetary nebula IRAS 18062+2410. Our UBV observations in 2000-2006 have confirmed the rapid irregular photometric variability of the star with a maximum amplitude as high as 0.4m in V that we found previously. The B-V and U-B color indices vary with amplitudes as high as 0.10m and 0.25m, respectively, and show no clear correlation with the brightness. Our V-band CCD observations on 11 nights in 2006 have revealed brightness trends during the night. The variability of IRAS 18062+2410 is similar in pattern to the light variations in other hot post-AGB objects and some of the nuclei of young planetary nebulae. We assume that pulsations and a variable stellar wind can be responsible for the variability of these stars. In addition to the rapid variability, our 12-year-long observations have revealed a systematic decline in the mean brightness of IRAS 18062+2410.
- ID:
- ivo://CDS.VizieR/II/122B
- Title:
- UBV Photoelectric Catalog: data 1953-1985
- Short Name:
- II/122B
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalogue collects all UBV photoelectric photometry data published since 1953 to the end of 1985 in the Johnson and Morgan system. In addition, data obtained in closely related systems using UBV filters have also been collected. All the data have been merged, yielding a final catalogue of 136719(*) entries concerning 87267 stars and components. The data have been taken from 1413 (UBV) and 127 (other) references found in 73 different periodicals. Great care has been taken to detect and correct all kinds of errors. (*) Two entries have been deleted in version 'B' of this catalogue The analysis of the data is published in 1987A&AS...71..119M
- ID:
- ivo://CDS.VizieR/II/193
- Title:
- UBV Photoelectric Cat: Data 1986-1992
- Short Name:
- II/193
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The previous compilation of UBV data (Mermilliod 1986a,b,c) contains the UBV photoelectric observations published between 1953 and 1986. The present supplement adds the data published between 1986 and the end of 1992 which represent 25639 new UBV data. The corresponding references were numbered in continuation of the main catalogue and go from number 1603 to 1784. See <http://obswww.unige.ch/gcpd/ph01.html> for a description of the UBV photoemtric system.
- ID:
- ivo://CDS.VizieR/II/308
- Title:
- UBV photoelectric photometry of Cepheids
- Short Name:
- II/308
- Date:
- 22 Feb 2022
- Publisher:
- CDS
- Description:
- The catalog contains approximatively 10,000 photoelectric observations of Cepheid variable stars, observed by the authors or derived from published data. The catalog contains data on more than 300 stars; of these approximately 230 can be classified as "well-observed".
- ID:
- ivo://CDS.VizieR/VI/19
- Title:
- UBV Photoelectric Sequences in SA 92-115
- Short Name:
- VI/19
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The UBV system was originally defined by ten bright standard stars, primarily in the northern sky. These stars are too bright to be used with large telescopes and cannot be reached from southern observatories. This catalog is a careful compilation of data on fainter stars in the equatorial Selected Areas. They are intended as a new set of standards which can be used to define the UBV system at fainter magnitudes in both hemispheres. The stars range in V between 6.0 and 14.9 with most between 9.0 and 13.0.
- ID:
- ivo://CDS.VizieR/J/ApJ/541/841
- Title:
- UBV photometry and ages of Trapezium systems
- Short Name:
- J/ApJ/541/841
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We sought to determine the maximum age of Trapezium systems by studying possible trapezium systems that were selected independently of their occurrence in H II regions. We started with the unpublished catalog by Allen, Tapia & Parrao (1977RMxAA...3..119A) of all the known visual systems having three or more stars in which the maximum separation is less than 3.0 times the minimum separation. Their catalog has 968 such systems whose most frequent primary type is F, which does not describe young systems. With a CCD on the Kitt Peak 0.9m telescope we obtained UBV frames for 265 systems accessible with our equipment on Kitt Peak. The frames were used to obtain UBV photometry for about 1500 stars with an accuracy of 0.04mag between V=7 and 14mag. Also these frames were used to obtain astrometry with an accuracy of +/-0.015{deg} in position angle and +/-0.01" in separation. For the brightest star in each system we obtained a spectral type to determine the distance and reddening to the system.
- ID:
- ivo://CDS.VizieR/II/248
- Title:
- UBV photometry and proper motions in M13
- Short Name:
- II/248
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The first epoch plates of 8 globular clusters, available in the plate collection of the Pulkovo Observatory, were taken with the normal astrograph at the end of the last and beginning of this century. These plates had been measured previously by N. Gamalei [1948, IzPul, 141] in order to determine the proper motions of the clusters. From 40 to 62 stars were used for this purpose and these were assumed to be cluster members on the basis of their proximity to the cluster centers. The epoch differences ranged from 30 to 45 years. As this time interval has now increased considerably (by about a factor of two), it is planned to redetermine the proper motions of these clusters, using more precise criteria for the selection of stars belonging to the cluster. In the previous study (N. Gamalei [1948, IzPul, 141]) only a limited number of field reference stars were measured, and as more complete data on the cluster, cluster members and field stars is desirable all the star images on the plates in an area 80'x80' will be measured in the present program. For future studies of the orbits of galactic clusters it is important that the absolute proper motions be on one system and therefore special attention should be devoted to this problem. The present paper is a continuation of an investigation of M13 and deals with the determination of the proper motions and U, B, V magnitudes of separate stars and also a redetermination of the proper motions of the cluster. The U, B, V magnitudes of the majority of 923 stars with measured proper motions were found from plates (table 2) taken with the 2 meter Schmidt telescope at Tautenburg and kindly lent to us by Professor N. Richter. The photoelectric standards as given by Savedoff [1956AJ.....61..254S] (table 7) and also U B V magnitudes of six bright field stars (table 8) observed by Mayer were used for calibration. A comparison of the determined B and V magnitudes of stars within an area of about 10'x10' centered on the cluster with those obtained by other authors indicates that the probable external errors do not exceed +/-0.03mag (table 15). However as the photoelectric magnitudes of fainter field stars were not available, a slight systematic error may be present in the derived magnitudes of these stars. Data on the plates used for the determination of the proper motions were given in Kadla [1963AZh....40..691K]. The relative proper motion of M 13, redetermined on the basis of a larger number of cluster members (80 in all, measured on 4 pairs of plates with a mean epoch difference equal to 61.4 years) is found to be {mu}x=+0.0008", {mu}y=-0.0014" with a probable error of +/-0.0002".
