- ID:
- ivo://CDS.VizieR/J/A+A/441/451
- Title:
- UBVRIJHK photometry of E-type galaxies
- Short Name:
- J/A+A/441/451
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Colour gradients are considered for a sample of circa 50 E-type galaxies in the Local Supercluster. The new data includes isophotal colour profiles in J-H, J-K, V-J and V-K, measured using 2MASS frames mostly from the Large Galaxies Atla s, V frames from previous work and V profiles from the literature. This is supplemented by U-B, B-V, B-R, V-I colour gradients obtained anew from published photometric data. The here available file gives our zero-point colours at r_e_/2 and the measured gradients for 54 objects, but for missing data.
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- ID:
- ivo://CDS.VizieR/J/PASP/126/521
- Title:
- UBVRIJHK photometry of RR Lyrae in M4
- Short Name:
- J/PASP/126/521
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present optical and near-infrared UBVRIJHK photometry of stars in the Galactic globular cluster M4 (NGC 6121) based upon a large corpus of observations obtained mainly from public astronomical archives. We concentrate on the RR Lyrae variable stars in the cluster, and make a particular effort to accurately reidentify the previously discovered variables. We have also discovered two new probable RR Lyrae variables in the M4 field: one of them by its position on the sky and its photometric properties is a probable member of the cluster, and the second is a probable background (bulge?) object. We provide accurate equatorial coordinates for all 47 stars identified as RR Lyraes, new photometric measurements for 46 of them, and new period estimates for 45. We have also derived accurate positions and mean photometry for 34 more stars previously identified as variable stars of other types, and for an additional five non-RR Lyrae variable stars identified for the first time here. We present optical and near-infrared color-magnitude diagrams for the cluster and show the locations of the variable stars in them. We present the Bailey (period-amplitude) diagrams and the period-frequency histogram for the RR Lyrae stars in M4 and compare them to the corresponding diagrams for M5 (NGC 5904). We conclude that the RR Lyrae populations in the two clusters are quite similar in all the relevant properties that we have considered. The mean periods, pulsation-mode ratios, and Bailey diagrams of these two clusters show support for the recently proposed "Oosterhoff-neutral" classification.
- ID:
- ivo://CDS.VizieR/J/ApJ/893/143
- Title:
- UBVRIJHK & spec. obs. of type Ia SN2019ein
- Short Name:
- J/ApJ/893/143
- Date:
- 07 Mar 2022 07:30:20
- Publisher:
- CDS
- Description:
- We present optical observations of the Type Ia supernova (SN) 2019ein, starting two days after the estimated explosion date. The spectra and light curves show that SN 2019ein belongs to a high-velocity (HV) and broad-line group with a relatively rapid decline in the light curves ({Delta}m_15_(B)=1.36+/-0.02mag) and a short rise time (15.37+/-0.55days). The SiII{lambda}6355 velocity, associated with a photospheric component but not with a detached high-velocity feature, reached ~20000km/s 12 days before the B-band maximum. The line velocity, however, decreased very rapidly and smoothly toward maximum light, to ~13000km/s, which is relatively low among HV SNe. This indicates that the speed of the spectral evolution of HV SNe Ia is correlated with not only the velocity at maximum light, but also the light-curve decline rate, as is the case for normal-velocity (NV) SNeIa. Spectral synthesis modeling shows that the outermost layer at >17000km/s is well described by an O-Ne-C burning layer extending to at least 25000km/s, and there is no unburnt carbon below 30000km/s; these properties are largely consistent with the delayed detonation scenario and are shared with the prototypical HV SN 2002bo despite the large difference in {Delta}m_15_(B). This structure is strikingly different from that derived for the well-studied NV SN 2011fe. We suggest that the relation between the mass of ^56^Ni (or {Delta}m_15_) and the extent of the O-Ne-C burning layer provides an important constraint on the explosion mechanism(s) of HV and NV SNe.
- ID:
- ivo://CDS.VizieR/J/A+A/428/555
- Title:
- UBVRIJHKs photometry of 2000cx
- Short Name:
- J/A+A/428/555
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have conducted a systematic and comprehensive monitoring programme of the type Ia supernova 2000cx at late phases using the VLT and HST. The VLT observations cover phases 360 to 480 days past maximum brightness and include photometry in the BVRIJH bands, together with a single epoch in each of U and Ks.
- ID:
- ivo://CDS.VizieR/II/7A
- Title:
- UBVRIJKLMNH Photoelectric Catalogue
- Short Name:
- II/7A
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog contains the results from star brightness measures in the first ten (UBVRIJKLMN) broad wavelength bands (Johnson 1965) and the additional bandpass H (Johnson et al. 1968). Data in the above system that have been published up to June 1977 are included. The source reference (Morel and Magnenat 1978) states that there are 5943 entries in the data set with data for 4494 stars. However, a count of the records by coded number shows that there are only 4486 unique entries (not 4494). The catalog includes coded identification numbers (Geneva system), 11 magnitudes, numbers of measurements in each filter, and references.
- ID:
- ivo://CDS.VizieR/J/A+A/349/619
- Title:
- UBVRI light curves of AA Tau in 1995
- Short Name:
- J/A+A/349/619
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have monitored the photometric, spectroscopic and polarimetric variations of the classical T Tauri star (CTTS) AA Tau over a period of a month. The light curve consists of more than 260 measurements in each of the B and V-bands over a continuous time period of 30 days and more than 180 measurements in the R and I-bands. This provides unprecedented detail of the photometric variations of a CTTS on timescales ranging from hours to weeks.
- ID:
- ivo://CDS.VizieR/J/A+A/409/169
- Title:
- UBVRI light curves of AA Tau in 1999
- Short Name:
- J/A+A/409/169
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the results of a synoptic study of the photometric and spectroscopic variability of the classical T Tauri star AA Tau on timescales ranging from a few hours to several weeks. The AA Tau light curve had been previously shown to vary with a 8.2d period, exhibiting a roughly constant brightness level, interrupted by quasi-cyclic fading episodes, which we interpreted as recurrent eclipses of the central star by the warped inner edge of its accretion disk (Bouvier et al. 1999, Cat. <J/A+A/349/619>). Our observations show the system is dynamic and presents non-stationary variability both in the photometry and spectroscopy.
- ID:
- ivo://CDS.VizieR/J/other/CoSka/42.39
- Title:
- UBVRI light curves of Dwarf nova Peg 2010
- Short Name:
- J/other/CoSka/42
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present our UBVRcIc CCD photometry of a new dwarf nova OT J213806.6+261957 in Pegasus, discovered during its superoutburst on May 6, 2010 and classified as a WZ Sge-type star. In the term May 15 - November 27, 2010, we obtained more than 10000 CCD observations of the nova. Twocolour diagrams together with the superoutburst evolutionary tracks of the nova are presented. The analysis of our data revealed the presence of ordinary superhumps with the mean period of 0.055106d and late superhumps with the period of 0.05490d. We calculated the orbital period of the dwarf nova Pegasi 2010 to be 0.0542+/-0.005d and estimated the mass of the red dwarf component in the binary as 0.09+/-0.01M_{sun}.
- ID:
- ivo://CDS.VizieR/J/AZh/88/894
- Title:
- UBVRI light curves of EQ Boo
- Short Name:
- J/AZh/88/894
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first estimates of the relative and absolute parameters of the eclipsing binary EQ Boo based on a light-curve analysis (P=5.43d, V=8.8m). This star is simultaneously Component A of the visual binary ADS 9422 (spectral types F7V + G0V; separation of the components 1.3"; magnitude difference 0.7m). The derived disagreement between the components' physical parameters and the assumption that they have the same age can be removed if there is a fourth, late-type star in the system. This is also able to explain the observed anomaly in the behavior of the O-C residuals at times of minima.
- ID:
- ivo://CDS.VizieR/J/A+A/415/289
- Title:
- UBVRI light curves of ER Vul
- Short Name:
- J/A+A/415/289
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- New photoelectric UBV and BVRI observations, secured during August-November of 2002 at two observatories distant in local time are analyzed together with two earlier photometric data sets and all available radial velocities to derive the most accurate ephemeris of the binary and to set limits on its basic physical elements. These observations were obtained as a support for a high-dispersion spectroscopic study, results of which will be published separately. It was found that radial velocities and photometric observations spanning 53 years can be reconciled with the linear ephemeris T_(prim.min.)_=HJD 2440182.25628(46) + 0.698095113(29)days x E, where the rms errors of the last digits are given in brackets. Masses of the stars are 1.02 and 0.97 solar masses and the binary separation is 4.170 solar radii. There is still a large uncertainty in the stellar radii. We also report the discovery of rapid light variations on a time scale of hours seen in the U band light curve and offer a few thoughts on the future investigation of this binary.
