- ID:
- ivo://CDS.VizieR/J/AJ/120/1548
- Title:
- V523 Cas UBVR_C_I_C_ photometry
- Short Name:
- J/AJ/120/1548
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The cool, overcontact, close binary, V523 Cassiopeiae was observed with the 1 m reflector at the US Naval Observatory, Flagstaff Station. The photometry was very good, with a precision on the order of a few millimagnitudes, but not numerous enough for complete light-curve analyses (e.g., differential corrections). A conventional published synthesis has been found acceptable as a fiducial model, and most of the observational weight has been used to develop a spot model for the stars and to support the validity of theoretical limb-darkening coefficients. Both photospheres and chromospheres contribute to the model. This result indicates that multifilter measures of this and similarly cool binaries are necessary for fuller descriptions of stellar activity cycles. A number of newly determined times of minimum light solidify the published rate of period variability.
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Search Results
22242. VCC 2062 CO(1-0) data cubes
- ID:
- ivo://CDS.VizieR/J/A+A/590/A92
- Title:
- VCC 2062 CO(1-0) data cubes
- Short Name:
- J/A+A/590/A92
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The physical mechanisms driving star formation (SF) in galaxies are still not fully understood. Tidal dwarf galaxies (TDGs), made of gas ejected during galaxy interactions, seem to be devoid of dark matter and have a near-solar metallicity. The latter makes it possible to study molecular gas and its link to SF using standard tracers (CO, dust) in a peculiar environment. We present a detailed study of a nearby TDG in the Virgo Cluster, VCC 2062, using new high-resolution CO(1-0) data from the Plateau de Bure, deep optical imaging from the Next Generation Virgo Cluster Survey (NGVS), and complementary multiwavelength data. Until now, there was some doubt whether VCC 2062 was a true TDG, but the new deep optical images from the NGVS reveal a stellar bridge between VCC 2062 and its parent galaxy, NGC 4694, which is clear proof of its tidal origin. Several high-resolution tracers (H{alpha}, UV, 8um, and 24um) of the star formation rate (SFR) are compared to the molecular gas distribution as traced by the CO(1-0). Coupled with the SFR tracers, the NGVS data are used with the CIGALE code to model the stellar populations throughout VCC 2062, yielding a declining SFR in the recent past, consistent with the low H{alpha}/UV ratio, and a high burst strength. HI emission covers VCC 2062, whereas the CO is concentrated near the HI maxima. The CO peaks correspond to two very distinct regions: one with moderate SF to the NE and one with only slightly weaker CO emission but with nearly no SF. Even where SF is clearly present, the SFR is below the value expected from the surface density of the molecular and the total gas as compared to spiral galaxies and other TDGs. After discussing different possible explanations, we conclude that the low surface brightness is a crucial parameter to understand the low SFR.
- ID:
- ivo://CDS.VizieR/J/ApJ/660/1186
- Title:
- VCC galaxies classification with SDSS
- Short Name:
- J/ApJ/660/1186
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- From a quantitative analysis of 413 Virgo Cluster early-type dwarf galaxies (dEs) with SDSS imaging data, we find that the dE class can be divided into multiple subpopulations that differ significantly in their morphology and clustering properties. Three dE subclasses are shaped like thick disks and show no central clustering: (1) dEs with disk features like spiral arms or bars, (2) dEs with central star formation, and (3) ordinary, bright dEs that have no or only a weak nucleus.
- ID:
- ivo://CDS.VizieR/J/A+A/552/A8
- Title:
- 454 VCC galaxies revised coordinates
- Short Name:
- J/A+A/552/A8
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We study the dust content of a large optical input sample of 910 early-type galaxies (ETG) in the Virgo cluster, also extending to the dwarf ETG, and examine the results in relation to those on the other cold ISM components. We have searched for far-infrared emission in all galaxies in the input sample using the 250um image of the Herschel Virgo Cluster Survey (HeViCS). This image covers a large fraction of the cluster with an area of ~55 square degrees. For the detected ETG we measured fluxes in five bands from 100 to 500um, and estimated the dust mass and temperature with modified black-body fits. Dust is detected above the completeness limit of 25.4mJy at 250um in 46 ETG, 43 of which are in the optically complete part of the input sample. In addition, dust is present at fainter levels in another six ETG. We detect dust in the four ETG with synchrotron emission, including M 87.
- ID:
- ivo://CDS.VizieR/J/AJ/131/814
- Title:
- VCC 1087 globular cluster system
- Short Name:
- J/AJ/131/814
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present an analysis of the globular cluster (GC) system of the nucleated dwarf elliptical galaxy VCC 1087 in the Virgo Cluster based on Keck LRIS spectroscopy and archival Hubble Space Telescope Advanced Camera for Surveys imaging. We estimate that VCC 1087 hosts a total population of 77+/-19 GCs, which corresponds to a relatively high V-band specific frequency of 5.8+/-1.4. The g_475_-z_850_ color distribution of the GCs shows a blue (metal-poor) peak with a tail of redder (metal-rich) clusters similar in color to those seen in luminous elliptical galaxies.
22246. vcd
- ID:
- ivo://lmd.jussieu/vcd/q/epn_core
- Title:
- vcd
- Date:
- 19 Apr 2024 00:05:16
- Publisher:
- Laboratoire Méteorologie Dynamique
- Description:
- The database contains some outputs of the VCD for the scenarios : {1) Standard cloud albedo Scenario, solar EUV average conditions ; 2) Standard cloud albedo Scenario, solar EUV minimum conditions ; 3) Standard cloud albedo Scenario, solar EUV maximum conditions ; 4) Low cloud albedo Scenario, solar EUV average conditions ; 5) High cloud albedo Scenario, solar EUV average conditions available}, at different positions of latitude and longitude. These VCD outputs are provided as Votables containing profiles of temperatures, pressures, density and abundances of main species for altitudes between 0 and 349.5 km from the surface.
22247. V810 Cen Geneva photometry
- ID:
- ivo://CDS.VizieR/J/A+A/337/779
- Title:
- V810 Cen Geneva photometry
- Short Name:
- J/A+A/337/779
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The light curve of the yellow supergiant V810 Centauri in the Geneva photometric system has been analysed with Date Compensate Fourier Transform and Weighted Wavelet Z-transform. Two periods around 150 and 100 days dominate the frequency spectrum but variable amplitudes and other modes are required to fully reproduce whole data set.
- ID:
- ivo://CDS.VizieR/J/A+A/591/A129
- Title:
- V346 Cen multiwavelength light curves
- Short Name:
- J/A+A/591/A129
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- New physical elements of the early B-type eclipsing binary V346 Cen are derived using the HARPS spectra downloaded from the ESO archive and also numerous photometric observations from various sources. A model of the observed times of primary and secondary minima that fits them best is a combination of the apsidal motion and an abrupt decrease in the orbital period from 6.322123d to 6.321843d (shortening by 24s), which occurred somewhere around JD 2439000. Assumption of a secularly decreasing orbital period provides a significantly worse fit. Local times of minima and the final solution of the light curve were obtained with the program PHOEBE. Radial velocities of both binary components, free of line blending, were derived via 2-D cross-correlation with a program built on the principles of the program TODCOR. The oxygen lines in the secondary spectra are weaker than those in the model spectra of solar chemical composition. Using the component spectra disentangled with the program KOREL, we find that both components rotate considerably faster than would correspond to the synchronization at periastron. The apside rotation known from earlier studies is confirmed and compared to the theoretical value.
- ID:
- ivo://CDS.VizieR/J/A+A/502/253
- Title:
- V636 Cen radial velocities curves
- Short Name:
- J/A+A/502/253
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The influence of stellar activity on the fundamental properties of stars around and below 1M_{sun}_ is not well understood. Accurate mass, radius, and abundance determinations from solar-type binaries exhibiting various levels of activity are needed for a better insight into the structure and evolution of these stars. We aim to determine absolute dimensions and abundances for the solar-type detached eclipsing binary V636Cen, and to perform a detailed comparison with results from recent stellar evolutionary models. uvby light curves and uvby{beta} standard photometry were obtained with the Stroemgren Automatic Telescope, radial velocity observations with the CORAVEL spectrometer, and high-resolution spectra with the FEROS spectrograph, all at ESO, La Silla. State-of-the-art methods were applied for the photometric and spectroscopic analyses.
- ID:
- ivo://CDS.VizieR/J/other/RAA/17.20
- Title:
- V977 Cep and V982 Cep long-term photometry
- Short Name:
- J/other/RAA/17.2
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Long-term BVRI photometric light curves of the pre-main sequence stars V977 Cep and V982 Cep during the period from 2000 October to 2016 August are presented. The stars are located in the vicinity of the reflection nebula NGC 7129. Our photometric data show that both stars exhibit strong photometric variability in all optical passbands, which is typical for Classical T Tauri stars. Using our observational data we analyze the reasons for the observed brightness variations. In the case of V977 Cep we identify previously unknown periodicity in its light curve.
