- ID:
- ivo://CDS.VizieR/J/PAZh/35/348
- Title:
- Photoelectric observation of Cepheids
- Short Name:
- J/PAZh/35/348
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- From December 2006 to January 2008, we performed 1699 BVIc observations for 46 low-amplitude Cepheids discovered in the course of the ASAS project using the 76-cm telescope of the South-African Astronomical Observatory (SAAO). We provide the tables of observations and V light and B-V and V-Ic color curves. These new observations, along with data from the ASAS-3 catalog, have been used to improve the elements of the light variations. Our data allow the number of known Galactic low-amplitude Cepheids to be almost doubled. This makes it possible to increase the number of distance indicators suitable for studying the structure of the inner Galactic arms by almost 15%.
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Search Results
- ID:
- ivo://CDS.VizieR/II/217
- Title:
- Photoelectric observations of Cepheids in UBV(RI)c
- Short Name:
- II/217
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Observations are listed in alphabetical order of the constellations. The standard deviation for every magnitude and color is 0.01 mag.
- ID:
- ivo://CDS.VizieR/II/285
- Title:
- Photoelectric observations of Cepheids in UBV(RI)c
- Short Name:
- II/285
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalog gathers the observation of 894 Cepheids made between 1986 to 2004. Observations are listed in alphabetical order of the constellations. The standard deviation for every magnitude and color is 0.01mag. This version supersedes the 1997 edition (Cat. <II/217>)
- ID:
- ivo://CDS.VizieR/J/A+AS/115/469
- Title:
- Photoelectric V photometry of 57 and 58 Tau
- Short Name:
- J/A+AS/115/469
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Between January 13 and 22 in 1989, new photoelectric photometry for 57 Tauri (=HD 27397, alpha(1950.0)=4h17m09s, delta=13deg55.0arcmin) and 58 Tauri (=HD 27459, alpha(1950.0)=4h17m46s, delta=14deg58.6arcmin) was made at the Xinlong Station of Beijing Astronomical Observatory, with the 60cm reflector and its classical single channel photoelectric photometer. The filter is Johnson V. The comparison star is HR1358 (=HD 27483). After the raw magnitudes of the target stars were corrected for extinction by applying the nightly determined extinction coefficient from the comparison, 863 measurements of 57 Tau and 155 measurements of 58 Tau relative to HR 1358 were obtained, respectively. And then, nightly zero-point adjustments normalized to zero were made for the two measurement sets.
- ID:
- ivo://CDS.VizieR/J/AJ/89/1707
- Title:
- Photographic observations of variable stars in M9
- Short Name:
- J/AJ/89/1707
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- New observations from the southern hemisphere have been used to check the periods for the 11 RR Lyrae variables in and around the globular cluster Messier 9. The periods were determined previously with data from northern observatories where M9 can only be observed over a small range in hour angle. Three of the eleven published periods were found to be in error. As a result of this, the mean period of the RRc variables has been revised from 0.279d to 0.341d, the mean period of the RRab variables has been revised from 0.614d to 0.621d,and a star previously believed to be an RR Lyrae has been reclassified as a Population II Cepheid. One of the RRc variables may be a double-mode pulsator. Another variable was studied, but the data were not sufficient for determining its period.
- ID:
- ivo://CDS.VizieR/J/A+A/374/968
- Title:
- Photometric and kinematic properties of LPVs
- Short Name:
- J/A+A/374/968
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The table gives individual absolute K and IRAS 12 and 25 luminosities of 800 LPVs. They are obtained by applying the Luri-Mennessier (LM, see below) calibration method to a sample composed of stars which are either of type M (O-rich), C (C-rich) or S (C/O~1), including Mira (M), SR (of both type a and b) and L variables. Astrometric data is taken exclusively from the HIPPARCOS Catalogue. Radial velocities are taken from the HIPPARCOS Input Catalogue. K band photometric data are gathered from various sources. Infrared magnitudes are derived from the fluxes measured by the IRAS satellite: m(12)=3.63-2.5log(F(12)) and m(25)=2.07-2.5log(F(25)) The stellar population from which the sample is extracted is assumed to be composed of several distinct groups that can differ in kinematics, luminosity or spatial distribution. The LM method determines the number of significant discriminating groups and produces, for each group, unbiased estimates of the mean parameters of the galactic and luminosity model. In a second step the method uses a Bayesian rule to statistically assign each star to a group. Table gives these assignations denoted as G(G') i.e. to group G in K and G'in IRAS. Three groups are identified in the K band. They can be interpreted as the galactic disk (D), old disk (OD) and extended disk (ED) populations. Four groups are identified in the IRAS bands. They are similar to those identified in the K band except that the old disk group is divided into ``bright'' (ODb) and ``faint'' (ODf) subgroups. Let us add that D, ODb and ED correspond to thick circumstellar envelope stars, while ODf is mainly composed of stars with a thin (or even lacking) envelope.
- ID:
- ivo://CDS.VizieR/J/A+AS/113/483
- Title:
- Photometric and radial velocity of RRLyr stars
- Short Name:
- J/A+AS/113/483
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Almost simultaneous measurements in the Geneva seven-colour photometric system and in radial velocities with the spectrometer CORAVEL for five RR Lyrae field stars were obtained in order to apply the Baade-Wesselink method to this kind of variable stars. In this paper the observational data on these stars are presented; the analysis of their physical parameters will be published in the forthcoming paper of the series.
- ID:
- ivo://CDS.VizieR/J/AJ/132/1714
- Title:
- Photometric and Spectroscopic study of TY Gru
- Short Name:
- J/AJ/132/1714
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have conducted a photometric and high-resolution spectroscopic analysis of the high-latitude (l=1{deg}, b=-55{deg}) metal-poor RR Lyrae star TY Gru (=CS 22881-071). We find this star to have large overabundances of carbon and neutron-capture elements. Mass transfer from an asymptotic giant branch binary companion prior to its RR Lyrae evolutionary state is the simplest explanation of this circumstance. Unfortunately, TY Gru is afflicted by the Blazhko effect, which greatly complicates accurate measurement of the motion of its center of mass. We have not yet detected the small orbital motion that would be produced by a distant degenerate companion of TY Gru.
- ID:
- ivo://CDS.VizieR/J/ApJ/787/163
- Title:
- Photometric data for SN 2009ip
- Short Name:
- J/ApJ/787/163
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present time series photometric and spectroscopic data for the transient SN 2009ip from the start of its outburst in 2012 September until 2013 November. These data were collected primarily with the new robotic capabilities of the Las Cumbres Observatory Global Telescope Network, a specialized facility for time domain astrophysics, and includes supporting high-resolution spectroscopy from the Southern Astrophysical Research Telescope, Kitt Peak National Observatory, and Gemini Observatory. Based on our nightly photometric monitoring, we interpret the strength and timing of fluctuations in the light curve as interactions between fast-moving ejecta and an inhomogeneous circumstellar material (CSM) produced by past eruptions of this massive luminous blue variable (LBV) star. Our time series of spectroscopy in 2012 reveals that, as the continuum and narrow H{alpha} flux from CSM interactions declines, the broad component of H{alpha} persists with supernova (SN)-like velocities that are not typically seen in LBVs or SN impostor events. At late times, we find that SN 2009ip continues to decline slowly, at <~0.01 mag/day, with small fluctuations in slope similar to Type IIn supernovae (SNe IIn) or SN impostors but no further LBV-like activity. The late-time spectrum features broad calcium lines similar to both late-time SNe and SN impostors. In general, we find that the photometric and spectroscopic evolution of SN 2009ip is more similar to SNe IIn than either continued eruptions of an LBV star or SN impostors but we cannot rule out a nonterminal explosion. In this context, we discuss the implications for episodic mass loss during the late stages of massive star evolution.
- ID:
- ivo://CDS.VizieR/J/A+A/559/A63
- Title:
- Photometric frequencies of HD 174966
- Short Name:
- J/A+A/559/A63
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The aim of this work was to use a multi-approach technique to derive the most accurate values possible of the physical parameters of the delta Sct star HD 174966, which was observed with the CoRoT satellite. In addition, we searched for a periodic pattern in the frequency spectra with the goal of using it to determine the mean density of the star. First, we extracted the frequency content from the CoRoT light curve. Then, we derived the physical parameters of HD 174966 and carried a mode identification out from the spectroscopic and photometric observations. We used this information to look for the models fulfilling all the conditions and discussed the inaccuracies of the method because of the rotation effects. In a final step, we searched for patterns in the frequency set using a Fourier transform, discussed its origin, and studied the possibility of using the periodicity to obtain information about the physical parameters of the star.
