- ID:
- ivo://CDS.VizieR/J/A+A/540/A15
- Title:
- V795 Her differential photometry
- Short Name:
- J/A+A/540/A15
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- V-band CCD observations of the cataclysmic variable V795 Her obtained between 2008 and 2010. The observing run on a given night consisted of a dense series of V-band images (exposure time of 20 seconds). Heliocentric Julian Date of each CCD image is given for the center of the exposure. A typical standard deviation of a single measurement of the magnitude of V795 Her on a given CCD frame was about 0.01 mag. GSC 02595-00575 (GSC2.3 N3JJ000148) was used as the comparison star (abbreviated as C) while GSC 02595-00718 served as the check star (abbreviated as C1).
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Search Results
- ID:
- ivo://CDS.VizieR/J/AZh/92/323
- Title:
- V1239 Her light curves in quiescence
- Short Name:
- J/AZh/92/323
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of a study of the integrated brightness of the SU UMa eclipsing binary V1239 Her are presented. The system was monitored on nine nights in 2013-2014 when the binary was in quiescence. The orbital period is refined (P_orb_=0.100082222(2)d) and the system's light curves obtained. These curves provide evidence for active processes in the system between outbursts: the depths of both minima and the amplitude of the pre-eclipse hump vary, and one of the light curves exhibits no hump at all. The parameters of the accretion disk, hot spot, and gas stream in V1239 Her for several epochs are determined in a "combined" model taking into account the contributions to the total radiation flux from the opaque part of the gas stream and the hot spot on the lateral surface of the disk.
20743. V446 Her V light curves
- ID:
- ivo://CDS.VizieR/J/AJ/141/121
- Title:
- V446 Her V light curves
- Short Name:
- J/AJ/141/121
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- V446 Her is the best example of an old nova which has developed dwarf nova (DN) eruptions in the post-nova state. We report on observed properties of the long-term light curve of V446 Her, using photometry over 19 years.
- ID:
- ivo://CDS.VizieR/J/other/NewA/48.58
- Title:
- V1044 Her VR differential photometry
- Short Name:
- J/other/NewA/48.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new CCD photometric observations of V1044 Her obtained on May 22, 23 and 24, 2015. From our data, we derived five new light curve minimum times. Combining our new results with previously available CCD light minimum times, we derived an updated ephemeris and discovered that the period of this binary system exhibits an oscillation. The cyclic variation may be caused by the light-time effect via the presence of a third body or magnetic activity cycle. We calculated the corresponding period of the third body to be 14.1+/-1.4 years or magnetic cycle to be 12.2+/-0.7 years. We analyzed our new asymmetric light curves to obtain photometric solutions and starspot parameters using the Wilson and Devinney program. The final results show that V1044 Her is a contact binary system with a degree of contact factor f=3.220(+/-0.002)%.
- ID:
- ivo://CDS.VizieR/J/MNRAS/346/390
- Title:
- VI and CMT1 photometry of NGC 2627
- Short Name:
- J/MNRAS/346/390
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Charge-coupled device (CCD) photometry in the Johnson V, Kron-Cousins I and Washington CMT1 systems is presented in the field of the poorly known open cluster NGC 2627.
- ID:
- ivo://CDS.VizieR/J/A+A/418/979
- Title:
- VI and CT1 photometry in NGC 2324 field
- Short Name:
- J/A+A/418/979
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have obtained CCD photometry in the Johnson V, Kron-Cousins I and CT_1_ Washington systems for NGC 2324, a rich open cluster located ~35{deg} from the Galactic anticentre direction. We measured V magnitudes and V-I colours for 2865 stars and T_1_ magnitudes and C-T_1_ colours for 1815 stars in an area of 13.6'x13.6' (pixel=0.4")
- ID:
- ivo://CDS.VizieR/J/A+A/459/423
- Title:
- VI and [Fe/H] of Fornax dSph RGB stars
- Short Name:
- J/A+A/459/423
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of the DART imaging and CaII triplet (CaT) survey of the Fornax dwarf spheroidal galaxy (dSph) at ESO. We collected hundreds of low resolution spectra of Red Giant Branch (RGB) stars in the CaT region, using VLT/FLAMES in Medusa mode, with the GIRAFFE spectrograph (grating LR8, resolving power R~6500). We list the results for the targets with a S/N per Angstrom >10 and an error in velocity <5km/s, because we found this to be the minimum for an accurate determination of velocity and equivalent width. We checked the sample to weed out any spurious object (e.g., broken fibres, background galaxies, foreground stars, spectra not consistent with RGBs). We use a 2.5sigma cut from the system velocity to derive which stars are probable velocity members of the Fornax dSph. We transform the equivalent width of the CaT lines of probable velocity members into metallicity ([Fe/H]) using the relation derived by Rutledge et al. (1997PASP..109..907R) and combining the CaT lines as in Tolstoy et al. (2001MNRAS.327..918T). The errors in [Fe/H] are based on S/N computations and adjusted to agree with repeated measurements.
- ID:
- ivo://CDS.VizieR/J/A+A/319/850
- Title:
- V, I , and Gunn z imaging of Terzan 4
- Short Name:
- J/A+A/319/850
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We study the globular cluster Terzan 4 projected close to the Galactic center, by means of V, I and Gunn z Colour-Magnitude Diagrams. The images were obtained under exceptional seeing conditions (0.35"-0.55") at the ESO New Technology Telescope equipped with SUSI. We derive a reddening of E(B-V)=2.35 and a distance from the Sun d_{sun}_=8.3kpc for Terzan 4. From the similarity of the VI Colour-Magnitude Diagrams of Terzan 4 and M30, in particular the presence of a blue horizontal branch, it could be as metal-poor as [Fe/H]=~-2.0. It is therefore another blue horizontal branch globular cluster located close to the Galactic center.
- ID:
- ivo://CDS.VizieR/J/A+A/572/A44
- Title:
- Vibrationally excited vinyl cyanide in Orion-KL
- Short Name:
- J/A+A/572/A44
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Laboratory characterization (18-1893 GHz) and astronomical detection (IRAM-30m: 80-280GHz, Orion-KL) of CH_2_CHCN (vinyl cyanide) in its ground and vibrationally excited states. Improving the understanding of rotational spectra of vibrationally excited vinyl cyanide with new laboratory data and analysis. The laboratory results allow searching for these excited state transitions in the Orion-KL line survey. Furthermore, rotational lines of CH_2_CHCN contribute to the understanding of the physical and chemical properties of the cloud. Laboratory measurements of CH_2_CHCN made on several different frequency-modulated spectrometers were combined into a single broadband 50-1900GHz spectrum and its assignment was confirmed by Stark modulation spectra recorded in the 18-40GHz region and by ab-initio anharmonic force field calculations. For analyzing the emission lines of vinyl cyanide detected in Orion-KL we used the excitation and radiative transfer code (MADEX) at LTE conditions. Detailed characterisation of laboratory spectra of CH_2CHCN in 9 different excited vibrational states (v_11_=1, v_15_=1, v_11_=2, v_10_=1<==>(v_11_=1,v_15_=1), v_11_=3/v_15_=2/v_14_=1, (v_11_=1,v_10_=1)<==>(v_11_=2, v_15_=1), v_9_$=1, (v_11_=1,v_15_=2)<==>(v_10_=1, v_15_=1)<==>(v_11_=1,v_14_=1), and v_11_=4) and detection of transitions in the v_11_=2 and v_11_=3 states for the first time in Orion-KL, and of those in the v_10_=1<==>(v_11_=1,v_15_=1) dyad of states for the first time in space. The rotational transitions of the ground state of this molecule emerge from four cloud components of hot core nature which trace the physical and chemical conditions of high mass star forming regions in the Orion-KL Nebula. The lowest energy vibrationally excited states of vinyl cyanide such as v_11_=1 (at 328.5K), v_15_=1 (at 478.6K), v_11_=2 (at 657.8K), the v_10_=1<==>(v_11_=1,v_15_=1) dyad (at 806.4/809.9K), and v_11_=3 (at 987.9K) are populated under warm and dense conditions, so they probe the hottest parts of the Orion-KL source. The vibrational temperatures derived for the v_11_=1, v_11_=2, and v_15_=1 states are 252+/-76K, 242+/-121K, and 227+/-68K, respectively; all of them close to the mean kinetic temperature of the hot core component (210K). The total column density of CH_2_CHCN in the ground state is (3.0+/-0.9)x10^15^cm^-2^. We report the detection of methyl isocyanide (CH_3_NC) for the first time in Orion-KL and a tentative detection of vinyl isocyanide (CH_2_CHNC) and give column density ratios between the cyanide and isocyanide isomers obtaining a N(CH_3_NC)/N(CH_3_CN) ratio of 0.002. Laboratory characterisation of many previously unassigned vibrationally excited states of vinyl cyanide at microwave to THz frequencies allowed us to detect these molecular species in Orion-KL. Column density and rotational and vibrational temperatures for CH_2_CHCN in their ground and excited states, as well as for the isotopologues, have been constrained by means of a sample of more than 1000 lines in this survey.
- ID:
- ivo://CDS.VizieR/J/other/BASI/29.519
- Title:
- VI CCD photometry in NGC 6631
- Short Name:
- J/other/BASI/29.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present VI CCD photometric observations of about 5500 stars up to a limiting magnitude of V~20 in an area of ~16'x16' around the cluster NGC 6631. The cluster parameters determined for the first time by fitting the theoretical isochrones in the V, (V-I) diagram of the cluster stars are E(V-I)=0.60+/-0.05mag, distance=2.6+/-0.5kpc, age=400+/-100Myr and metallicity, Z=0.05. The cluster diameter determined from the radial density profile is 4.8+-0.5pc. The mass function of the cluster has a slope of 2.1+/-05.
