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- ID:
- ivo://CDS.VizieR/J/A+A/457/637
- Title:
- UBVJHK synthetic photometry of Galactic O stars
- Short Name:
- J/A+A/457/637
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The development of powerful infrared observational techniques enables the study of very extincted objects and young embedded star-forming regions. This is especially interesting in the context of massive stars that form and spend a non negligible fraction of their life still enshrouded in their parental molecular cloud. Spectrophotometric calibrations are thus necessary to constrain the physical properties of heavily extincted objects.
- ID:
- ivo://CDS.VizieR/III/151
- Title:
- UBV K Stars South Galactic Pole
- Short Name:
- III/151
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- B and V photographic photometry is collected for approximately 2000 stars near the south galactic pole with 0.8<B-V<1.20; v<19.0, and B<20.06. Velocities with respect to the local standard of rest are provided for approximately 500 K dwarfs and K giants. table8.dat contains photometry in 11.5 square degrees towards the South Galactic Pole, derived from UK Schmidt data, and table9.dat contains photometric data over 0.72 square degrees, derived from 4 B and 3 V plates from Las Campanas Observatory. table10.dat, table11.dat and table12.dat contain velocities for dwarf stars.
22654. UBV light cures of KW Persei
- ID:
- ivo://CDS.VizieR/J/A+A/373/950
- Title:
- UBV light cures of KW Persei
- Short Name:
- J/A+A/373/950
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The table 4 summarizes the photoelectric UBV magnitudes of the eclipsing binary KW Per. This observational material was taken at the Observatories of the Astronomical Institute of the Slovak Academy of Sciences at the Stara Lesna (SL) and Skalnate Pleso (SP), as well as at the Astronomical Station of the National Observatory of Athens at Kryonerion (KR). The observations were carried out in 25 runs (24 nights) during the period from December 4th 1996 to November 25th 1998 in 112 hours of pure observational time. At the observatories SL and SP identical Cassegrain telescopes with a diameter of 60 cm were used. The observations of KR were performed by the same type of telescope with diameter of the primary mirror 120 cm. An one-channel photoelectric photometer with digital converter was used, as well as standard UBV Johnson's filters. All observational data, collected in table 4 are in the form of phase and magnitude for U, B and V colours. For determination of the phase, a newly derived ephemeris was used (this paper): MinI = HJD 2451143.27313 + 0.93125953 x E
- ID:
- ivo://CDS.VizieR/J/PAZh/32/737
- Title:
- UBV light curve and spectroscopy of StHa62
- Short Name:
- J/PAZh/32/737
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Photoelectric observations of HD 51585 (OY Gem), a B[e] star with an infrared excess and a candidate for protoplanetary nebulae, obtained with a 60-cm telescope at the Crimean Station of Sternberg Astronomical Institute in 1992-2005 are presented. The star exhibited rapid irregular brightness variations with amplitudes from 0.1mag in the V band to 0.2mag in the U band within the observing season as well as slow systematic variations. with a quasi-period of ~2800-days. Low-resolution spectroscopy performed in 1994-2005 has revealed significant variability of the Balmer and Paschen hydrogen emission lines as well as the HeI and OI lines. Equivalent widths are given for the HI, HeI, OI, and FeII lines. Correlation has been found between the star's photometric variability and the hydrogen line intensities.
22656. UBV light curves of BE UMa
- ID:
- ivo://CDS.VizieR/J/AZh/80/535
- Title:
- UBV light curves of BE UMa
- Short Name:
- J/AZh/80/535
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present UBV photoelectric observations of BE Ursae Majoris, precataclysmic eclipsing variable with a strong reflection effect.
- ID:
- ivo://CDS.VizieR/J/ApJ/811/131
- Title:
- UBV light curves of DQ Tau and UZ Tau E
- Short Name:
- J/ApJ/811/131
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The transfer of matter between a circumbinary disk and a young binary system remains poorly understood, obscuring the interpretation of accretion indicators. To explore the behavior of these indicators in multiple systems, we have performed the first systematic time-domain study of young binaries in the ultraviolet. We obtained far- and near-ultraviolet HST/COS spectra of the young spectroscopic binaries DQ Tau and UZ Tau E. Here we focus on the continuum from 2800 to 3200{AA} and on the CIV doublet ({lambda}{lambda}1548.19,1550.77{AA}) as accretion diagnostics. Each system was observed over three or four consecutive binary orbits, at phases ~0, 0.2, 0.5, and 0.7. Those observations are complemented by ground-based U-band measurements. Contrary to model predictions, we do not detect any clear correlation between accretion luminosity and phase. Further, we do not detect any correlation between CIV flux and phase. For both stars the appearance of the CIV line is similar to that of single Classical T Tauri Stars (CTTSs), despite the lack of stable long-lived circumstellar disks. However, unlike the case in single CTTSs, the narrow and broad components of the CIV lines are uncorrelated, and we argue that the narrow component is powered by processes other than accretion, such as flares in the stellar magnetospheres and/or enhanced activity in the upper atmosphere. We find that both stars contribute equally to the narrow component CIV flux in DQ Tau, but the primary dominates the narrow component CIV emission in UZ Tau E. The CIV broad component flux is correlated with other accretion indicators, suggesting an accretion origin. However, the line is blueshifted, which is inconsistent with its origin in an infall flow close to the star. It is possible that the complicated geometry of the region, as well as turbulence in the shock region, are responsible for the blueshifted line profiles.
- ID:
- ivo://CDS.VizieR/J/PAZh/30/855
- Title:
- UBV light curves of IRAS 19200+3457
- Short Name:
- J/PAZh/30/855
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of UBV photometric and spectroscopic observations of the early B supergiant with an IR excess IRAS 19200+3457.
22659. UBV light curves of IU Aur
- ID:
- ivo://CDS.VizieR/J/A+A/403/675
- Title:
- UBV light curves of IU Aur
- Short Name:
- J/A+A/403/675
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The data files includes photometric observations of the eclipsing binary system IU Aurigae. New photometric observations were made on 13 nights at the Ankara University Observatory (AUO) in 1997/1998 by using a 30cm Cassegrain-Maksutov telescope. The detector was a single-channel, uncooled SSP-5 photometer equipped with Hamamatsu R1414 photomultiplier tube. Observational standard errors determined from check star (HD 35633 = SAO 58053) measurements are 0.014mag, 0.012mag, and 0.018mag in U, B, and V filters, respectively. A total of 966, 959, 947 original data and of 118, 117, 117 reduced (averaged) data points is included for each UBV filters, respectively.
22660. UBV light curves of LT Del
- ID:
- ivo://CDS.VizieR/J/PAZh/37/377
- Title:
- UBV light curves of LT Del
- Short Name:
- J/PAZh/37/377
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Long-term photometric and spectroscopic observations of the yellow symbiotic star LT Del are analyzed. UBV light curves are presented. Based on the observations of 20 cycles, we have refined the orbital period of the star, P=476.0d+/-1.0d. The brightness has been found to be unstable at some orbital phases with an amplitude up to 0.3m.