- ID:
- ivo://CDS.VizieR/II/273
- Title:
- MISAO new variable stars
- Short Name:
- II/273
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This report describes 300 new variable stars (MisV0001-MisV0300) discovered in the course of the MISAO Project The goal of the MISAO Project, standing for Multitudinous Image-based Sky-survey and Accumulative Observations, is to discover new celestial objects or to obtain photometric data from multitudinous astronomical images. The details are described on the MISAO Project Home Page: http://www.info.waseda.ac.jp/muraoka/members/seiichi/misao/
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Search Results
- ID:
- ivo://CDS.VizieR/J/MNRAS/463/3513
- Title:
- M67 Kepler/K2-Campaign-5 variable stars
- Short Name:
- J/MNRAS/463/3513
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We revisit the photometric variability of stars in the M67 field using Kepler/K2-Campaign-5 light curves. In our previous work (Gonzalez, 2016, Cat. J/MNRAS/459/1060), we limited the search area around M67 to that of a recent ground-based study. In the present work, we expand the search area and apply a more rigorous period-finding algorithm to determine the rotation periods of 98 main-sequence cluster members from the same data. In addition, we derive periods of 40 stars from the K2SC detrended light curves. We determine the mean period of single sun-like main-sequence cluster members to be 29.6+/-0.6d. Assuming the periods correspond to stellar rotation, the corresponding mean gyrochronological (gyro-) age is 5.4+/-0.2Gyr.
- ID:
- ivo://CDS.VizieR/J/MNRAS/463/1831
- Title:
- M67 Kepler/K2 variable stars
- Short Name:
- J/MNRAS/463/1831
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In the third paper of this series we continue the exploitation of Kepler/K2 data in dense stellar fields using our PSF-based method. This work is focused on a ~720-arcmin^2^ region centred on the Solar-metallicity and Solar-age open cluster M 67. We extracted light curves for all detectable sources in the Kepler channels 13 and 14, adopting our technique based on the usage of a high-angular-resolution input catalogue and target-neighbour subtraction. We detrended light curves for systematic errors, and searched for variables and exoplanets using several tools. We found 451 variables, of which 299 are new detection. Three planetary candidates were detected by our pipeline in this field. Raw and detrended light curves, catalogues, and K2 stacked images used in this work will be released to the community.
- ID:
- ivo://CDS.VizieR/J/ApJS/154/623
- Title:
- M31 Long Period Variables : Photometry
- Short Name:
- J/ApJS/154/623
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A significant fraction of the disk of M31 has been surveyed for long-period variable stars. We report the results, including near-infrared photometry of almost 2000 variables, and light curves in the i band. The period-luminosity relation suggests that most of the variables are asymptotic giant branch stars, and their luminosity function can be understood in terms of mass-loss rates, which increase with increasing luminosity on the giant branch, and star formation rates, which were a few times higher a billion years ago in M31 than they are today. We see some supergiant long-period variables, but somewhat fewer than expected based on their frequency in M33, and confined to the ring of star formation in M31 seen in the IRAS and 2MASS surveys.
- ID:
- ivo://CDS.VizieR/J/A+A/592/A51
- Title:
- 3mm and 1mm spectra of IRC +10420
- Short Name:
- J/A+A/592/A51
- Date:
- 24 Nov 2021 07:04:25
- Publisher:
- CDS
- Description:
- Our knowledge of the chemical properties of the circumstellar ejecta of the most massive evolved stars is particularly poor. We aim to study the chemical characteristics of the prototypical yellow hypergiant star, IRC +10420. For this purpose, we obtained full line surveys at 1 and 3mm atmospheric windows. We have identified 106 molecular emission lines from 22 molecular species. Approximately half of the molecules detected are N-bearing species, in particular HCN, HNC, CN, NO, NS, PN, and N_2_H. We used rotational diagrams to derive the density and rotational temperature of the different molecular species detected. We introduced an iterative method that allows us to take moderate line opacities into account.
- ID:
- ivo://CDS.VizieR/J/A+A/570/A116
- Title:
- Monitoring of the V777 Her star KUV 05134+2605
- Short Name:
- J/A+A/570/A116
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- KUV 05134+2605 is one of the 21 pulsating DB white dwarfs (V777 Her or DBV variables) known so far. The detailed investigation of the short-period and low-amplitude pulsations of these relatively faint targets requires considerable observational efforts from the ground, long-term single-site or multi-site observations. The observed amplitudes of excited modes undergo short-term variations in many cases, which makes determining pulsation modes difficult. We aim to determine the pulsation frequencies of KUV 05134+2605, find regularities between the frequency and period components, and perform an asteroseismic investigation for the first time.
- ID:
- ivo://CDS.VizieR/J/A+A/371/986
- Title:
- Monoperiodic pulsating stars in the OGLE database
- Short Name:
- J/A+A/371/986
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Files table3, table4, table5 contain the parameters of the Fourier fits of the light curves of monoperiodic OGLE variables with P<1d (High-Amplitude {delta} Scuti (HADS), RRc and RRab stars respectively).
- ID:
- ivo://CDS.VizieR/J/AcA/58/279
- Title:
- Moscow Digital Variables in Field of 66 Oph
- Short Name:
- J/AcA/58/279
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We initiated digitization of the Moscow collection of astronomical plates using flatbed scanners. Techniques of photographic photometry of the digital images were applied, enabling an effective search for new variable stars. Our search for new variables among 140000 stars in the 10{deg}x5{deg} northern half of the field centered at 66 Oph, photographed with the Sternberg Institute's 40-cm astrograph in 1976-1995, gave 274 new discoveries, among them: 2 probable Population II Cepheids, 81 eclipsing variables, 5 high-amplitude delta Sct stars (HADSs), 82 RR Lyr stars, 62 red irregular variables and 41 red semiregular stars, 1 slow irregular variable not red in color. Ephemerides were determined for periodic variable stars. We detected about 30 variability suspects for follow-up CCD observations, confirmed 11 stars from the New Catalog of Suspected Variable Stars, and derived new ephemerides for 2 stars already contained in the General Catalog of Variable Stars.
- ID:
- ivo://CDS.VizieR/J/ApJ/864/59
- Title:
- M31 PAndromeda Cepheid sample in four HST bands
- Short Name:
- J/ApJ/864/59
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using the M31 PAndromeda Cepheid sample and the HST PHAT data we obtain the largest Cepheid sample in M31 with HST data in four bands. For our analysis we consider three samples: A very homogeneous sample of Cepheids based on the PAndromeda data, the mean magnitude corrected PAndromeda sample and a sample complementing the PAndromeda sample with Cepheids from literature. The latter results in the largest catalog with 522 fundamental mode (FM) Cepheids and 102 first overtone (FO) Cepheids with F160W and F110W data and 559 FM Cepheids and 111 FO Cepheids with F814W and F475W data. The obtained dispersion of the Period-Luminosity relations (PLRs) is very small (e.g. 0.138mag in the F160W sample I PLR). We find no broken slope in the PLRs when analyzing our entire sample, but we do identify a subsample of Cepheids that causes the broken slope. However, this effect only shows when the number of this Cepheid type makes up a significant fraction of the total sample. We also analyze the sample selection effect on the Hubble constant.
- ID:
- ivo://CDS.VizieR/J/AJ/118/453
- Title:
- M9 RR Lyrae CCD observations
- Short Name:
- J/AJ/118/453
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- CCD observations have been used to study 16 of the previously known variables in the Oosterhoff type II globular cluster M9. The properties of the RR Lyrae variables in M9 are compared with those in the Oosterhoff type I cluster M3. Methods devised by Simon, Jurcsik, & Kovacs have been used to derive physical parameters for the stars from Fourier analysis. The mean metal abundance so derived for M9, [Fe/H]=-1.77, is in good agreement with the metal abundance derived from spectroscopic observations. All methods for calculating the absolute magnitudes of RR Lyrae variables from Fourier coefficients indicate that the RR Lyrae variables in M9 are more luminous than those in M3. However, there are three RR Lyrae stars in M3 that may be as bright as the M9 stars. These three are thought to be in a more advanced evolutionary state than the other M3 RR Lyrae stars. Absolute magnitudes have also been derived for the RR Lyrae stars in M68 and M107. The different methods predict that RR Lyrae stars in metal-poor clusters are more luminous than those in more metal-rich clusters, but there are inconsistencies in the relative luminosities derived by the different methods.
