- ID:
- ivo://CDS.VizieR/J/PASP/109/977
- Title:
- VI photometry of CG Muscae
- Short Name:
- J/PASP/109/977
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have obtained extensive photometry of the suspected cataclysmic variable CG Muscae, and find that it is in fact an RR Lyrae star. We measure its light curve parameters and derive physical parameters including metal abundance, reddening, and distance. We also have discovered three new variables in the nearby field. We suspect that two are contact binary stars, while the third is too faint to determine its variability type with certainty. (c)Astronomical Society of the Pacific
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/MNRAS/346/1143
- Title:
- VI photometry of Collinder 121
- Short Name:
- J/MNRAS/346/1143
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a VI photometric catalogue towards the open cluster Cr 121. XMM-Newton and ROSAT data are used to discover a low-mass pre-main sequence (PMS) along this sightline. de Zeeuw et al. (1999, Cat. <J/AJ/117/354>) have identified Cr 121 as a moving group, using Hipparcos data, at a distance of 592pc; we reject the scenario that these low-mass PMS stars are associated with that association. By considering the higher mass main sequence stellar membership of the groups along this sightline, the density of low-mass PMS stars and their age spread we argue that the low-mass PMS stars are associated with a young, compact cluster at a distance of 1050pc.
- ID:
- ivo://CDS.VizieR/J/AJ/124/3222
- Title:
- VI photometry of Draco and UMi galaxies
- Short Name:
- J/AJ/124/3222
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present (V, I) photometry of two wide (~25x25arcmin^2^) fields centered on the low surface brightness dwarf spheroidal galaxies Draco and Ursa Minor. New estimates of the distance to these galaxies are provided [(m-M)_0_(UMi)=19.41+/-0.12 and (m-M)_0_(Dra)=19.84+/-0.14], and a comparative study of their evolved stellar population is presented.
- ID:
- ivo://CDS.VizieR/J/A+AS/124/559
- Title:
- VI photometry of dwarf galaxies
- Short Name:
- J/A+AS/124/559
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Tables show the photometry and colour index for the observed galaxy, with the image parameter SHARP. This parameter is a measure of the difference between the observed width of the object and the psf model.
- ID:
- ivo://CDS.VizieR/J/AJ/116/469
- Title:
- VI photometry of galactic cepheids
- Short Name:
- J/AJ/116/469
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present results of a survey of a 6deg^2^ region near l=60{deg}, b=0{deg} to search for distant Milky Way Cepheids. Few such Cepheids are known at distances >~ R_0_, limiting large-scale Milky Way disk models derived from Cepheid kinematics; this work was designed to find a sample of distant Cepheids for use in such models. The survey was conducted in the V and I bands over eight epochs, to a limiting I~=18, with a total of almost 5 million photometric observations of over 1 million stars. We present a catalog of 578 high-amplitude variables discovered in this field. Cepheid candidates were selected from this catalog on the basis of variability and color change and observed again the following season. We confirm 10 of these candidates as Cepheids with periods from 4 to 8 days, most at distances greater than 3kpc. Many of the Cepheids are heavily reddened by intervening dust, some with implied extinction A_V_>10mag. With a future addition of infrared photometry and radial velocities, these stars alone can provide a constraint on R_0_ to 8% and in conjunction with other known Cepheids should provide good estimates of the global disk potential ellipticity.
- ID:
- ivo://CDS.VizieR/J/AcA/60/295
- Title:
- VI photometry of Galactic disk field stars
- Short Name:
- J/AcA/60/295
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present OGLE-III Photometric Maps of the Galactic disk fields observed during the OGLE-III campaigns for low luminosity transiting objects that led to the discovery of the first transiting exoplanets. The maps contain precise, calibrated VI photometry of about 9 million stars from 21 OGLE-III fields in the Galactic disk observed in the years 2002-2009 and covering more than 7 square degrees in the sky. Precise astrometry of these objects is also provided. We discuss quality of the data and present a few color-magnitude diagrams of the observed fields.
- ID:
- ivo://CDS.VizieR/J/AJ/131/2538
- Title:
- VI Photometry of globular cluster Palomar 11
- Short Name:
- J/AJ/131/2538
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new photometry for the Galactic thick-disk globular cluster Palomar 11 extending well past the main-sequence turnoff in the V and I bands.
- ID:
- ivo://CDS.VizieR/J/MNRAS/343/665
- Title:
- VI photometry of globular cluster systems
- Short Name:
- J/MNRAS/343/665
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have studied the globular cluster systems of seven giant, edge-on spiral galaxies using Hubble Space Telescope imaging in V and I. The galaxy sample covers the Hubble types Sa to Sc, allowing us to study the variation of the properties of globular cluster systems along the Hubble sequence.
- ID:
- ivo://CDS.VizieR/J/A+A/581/A13
- Title:
- VI photometry of globular ESO 37-1
- Short Name:
- J/A+A/581/A13
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In the Milky Way, most globular clusters are highly conspicuous objects that were found centuries ago. However, a few dozen of them are faint, sparsely populated systems that were identified largely during the second half of the past century. One of the faintest is ESO 37-1 (E 3) and as such it remains poorly studied, with no spectroscopic observations published so far although it was discovered in 1976. We investigate the globular cluster E3 in an attempt to better constrain its fundamental parameters. Spectroscopy of stars in the field of E3 is shown here for the first time. Deep, precise VI CCD photometry of E3 down to V~26mag is presented and analysed. Low-resolution, medium signal-to-noise ratio spectra of nine candidate members are studied to derive radial velocity and metallicity. Proper motions from the UCAC4 catalogue are used to explore the kinematics of the bright members of E3. Isochrone fitting indicates that E3 is probably very old, with an age of about 13Gyr; its distance from the Sun is nearly 10kpc. It is also somewhat metal rich with [Fe/H]=-0.7. Regarding its kinematics, our tentative estimate for the proper motions is ({mu}_{alpha}*cos{delta}, {mu}_{delta}_=(-7.0+/-0.8, 3.5+/-0.3)mas/yr (or a tangential velocity of 382+/-79km/s) and for the radial velocity 45+/-5km/s in the solar rest frame. E3 is one of the most intriguing globular clusters in the Galaxy. Having an old age and being metal rich is clearly a peculiar combination, only seen in a handful of objects like the far more conspicuous NGC 104 (47 Tucanae). In addition, its low luminosity and sparse population make it a unique template for the study of the final evolutionary phases in the life of a star cluster. Unfortunately, E3 is among the most elusive and challenging known globular clusters because field contamination severely hampers spectroscopic studies.
- ID:
- ivo://CDS.VizieR/J/ApJ/453/48
- Title:
- VI photometry of HST faint field galaxies
- Short Name:
- J/ApJ/453/48
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a complete morphologically classified sample of 144 faint field galaxies from the HST Medium Deep Survey with 20.0=<Imag<22.0mag. We compare the global properties of the ellipticals and early- and late-type spirals and find a non-negligible fraction (13/144) of compact blue [(V-I)<1.0mag] systems with r^1/4^ profiles. We give the differential galaxy number counts for ellipticals and early-type spirals independently and find that the data are consistent with no-evolution predictions based on conventional flat Schechter luminosity functions (LFs) and a standard cosmology. Conversely, late-type/irregulars show a steeply rising differential number count with slope ({delta}logN/{delta}m)=0.64+/-0.1. No-evolution models based on the Loveday et al. (1992ApJ...390..338L) and Marzke et al. (1994AJ....108..437M & 1994ApJ...428...43M) local luminosity functions underpredict the late-type/irregular counts by 1.0 and 0.5dex, respectively, at Imag=21.75mag. Examination of the irregulars alone shows that ~50% appear inert and the remainder have multiple cores. If the inert galaxies represent a non-evolving late-type population, then a Loveday-like LF ({alpha}=~-1.0) is ruled out for these types, and an LF with a steep faint end ({alpha}=~-1.5) is suggested. If multiple core structure indicates recent star formation, then the observed excess of faint blue field galaxies is likely a result of et evolutionary processes acting on a steep field LF for late-type/irregulars. The evolutionary mechanism is unclear, but 60% of the multiple-core irregulars show close companions. To reconcile a Marzke-like LF with the faint redshift surveys, this evolution must be preferentially occurring in the brightest late-type galaxies with z>=0.5 at m_I_=21.75mag.
