- ID:
- ivo://CDS.VizieR/J/PASP/83/800
- Title:
- UBV photometry in NGC 6025
- Short Name:
- J/PASP/83/800
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The table 1 lists photoelectric UBV measures for 78 stars in the open cluster NGC 6025. Distance and age estimates derived are 760pc and 100Myr. The brightest star, HD 143448, is a known emission star and is very probably a member of the cluster. Accurate positions and identifications of the stars were added by B. Skiff (Lowell Observatory) in November 2009.
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- ID:
- ivo://CDS.VizieR/J/A+A/361/945
- Title:
- UBV photometry in open cluster NGC 2539
- Short Name:
- J/A+A/361/945
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present UBV photoelectric observations of 345 stars in the field of the southern open cluster NGC 2539. The analysis of these data allows to determine that 169 stars are probable members of the cluster main sequence, while 23 are possible members.
1163. UBV photometry in RCW173
- ID:
- ivo://CDS.VizieR/J/A+A/534/A114
- Title:
- UBV photometry in RCW173
- Short Name:
- J/A+A/534/A114
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The discovery of several clusters of red supergiants towards l=24{deg}-30{deg} has triggered interest in this area of the Galactic plane, where lines of sight are very complex and previous explorations of the stellar content were very preliminary. We attempt to characterise the stellar population associated with the HII region RCW 173 (=Sh2-60), located at l=25.3{deg}, as previous studies have suggested that this population could be beyond the Sagittarius arm.
- ID:
- ivo://CDS.VizieR/J/AJ/130/1194
- Title:
- UBV photometry in Ruprecht 91
- Short Name:
- J/AJ/130/1194
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Photoelectric UBV photometry and star counts are presented for stars in the previously unstudied open cluster Ruprecht 91, supplemented by observations for stars in adjacent regions surrounding the Cepheids SX Car and VY Car, including new observations for the latter. Ruprecht 91 is typical of groups associated with Cepheids, with an evolutionary age of ~8x10^7^yr, but it is only 980+/-8pc distant, much closer than the Cepheids.
- ID:
- ivo://CDS.VizieR/J/A+AS/115/325
- Title:
- UBV photometry in the cluster NGC 7510
- Short Name:
- J/A+AS/115/325
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Three-colour photographic photometry of the young open cluster NGC 7510 based upon UBV observations made with the 122cm and 182cm Asiago reflectors is presented here. A mean colour excess E(B-V)=1.12, a distance of 3.09kpc could be achieved for this cluster and 31 stars could be identified as photometric physical members. An age of 10^7^years has been derived by comparison with standard isochrones. The discrepancy between the photometric and spectroscopic distances obtained for some stars is discussed and comparisons with recent investigations of the same object are also given.
- ID:
- ivo://CDS.VizieR/J/AJ/102/642
- Title:
- UBV photometry in Westerlund 2
- Short Name:
- J/AJ/102/642
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Two new Galactic Wolf-Rayet stars were found in open clusters: a WN4 star in the O9 cluster Sher 1 and a WN7 star in the O7 cluster Westerlund 2. This confirms a previous trend, namely that fainter, hotter WN stars tend to be older than brighter, cooler WN stars. This may be a consequence of evolution via extreme mass loss.
- ID:
- ivo://CDS.VizieR/II/123A
- Title:
- UBV Photometry of Faint Stars (V>14.5) in M67
- Short Name:
- II/123A
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalog is the result of a program of photographic photometry. Four plates each were taken of M67 in U, B, and V, and were measured and reduced using the standards of Johnson and Sandage (1955) and Eggen and Sandage (1964). The catalog lists identification, V, B-V, U-B, proper motion, and membership probability for 1,053 stars.
- ID:
- ivo://CDS.VizieR/J/A+A/409/541
- Title:
- UBV photometry of IC 2395
- Short Name:
- J/A+A/409/541
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report UBV photoelectric photometry for 273 stars in the fields of the open clusters IC 2395 and BH 47. Our postulate is that, rather than two different clusters in this region of Vela, there is only one, which we call IC 2395 = BH 47. The cluster is centered at about RA = 8h 42min 33s, and DE = -48{deg} 06' 48" (2000), its angular diameter being ~19'. The analysis of the photometric data yields 61 probable cluster members and 16 possible members. Photometric membership probabilities show good agreement with those obtained from a proper motion study for 21 stars in common. The reddening across the cluster appears to be uniform, the mean E(B-V) value being 0.09+/-0.02. The true distance modulus is V_0_-Mv=9.52+/-0.10, corresponding to a distance from the Sun of (800+/-40)pc and 48pc below the Galactic plane. The cluster age, determined by fitting isochrones with core overshooting, turns out to be (6+/-2)Myr. There is a strong likelihood that IC 2395 = BH 47 is physically connected to the Vela OB1C association.
- ID:
- ivo://CDS.VizieR/J/A+AS/128/131
- Title:
- UBV photometry of NGC 2323
- Short Name:
- J/A+AS/128/131
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- UBV and DDO photoelectric photometry in the field of the open cluster NGC 2323 is presented. The analysis yields 109 probable members; one of them being a red giant, and 3 possible members. The basic cluster parameters are derived. NGC 2323 appears not to be physically connected to the CMa OB1 association.
- ID:
- ivo://CDS.VizieR/J/A+A/493/71
- Title:
- UBV photometry of Shorlin 1
- Short Name:
- J/A+A/493/71
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The detailed spiral structure of the outer Galactic disk remains poorly constrained, and for several line of sights in the Galaxy we depend on model extrapolations. One of these regions is the fourth Galactic quadrant, between Vela and Carina (270{deg}<=l<=300{deg}), where, apart from the conspicuous Carina branch of the Carina Sagittarius arm, no spiral arms have been detected so far in the optical beyond l~270{deg}. By means of deep UBVI photometry, we search for spiral features in known low absorption windows. Although observationally demanding, U photometry constitutes a powerful tool for detecting and characterizing distant aggregates of young stars, and allows firmer distance estimates to be derived. We study a direction close to the tangent (l~290{deg}) of the Carina arm, in an attempt to detect optical spiral tracers far beyond the Carina branch, where radio observations and model predictions appear to indicate the presence of an extension of the Perseus and Norma-Cygnus spiral arms in the fourth quadrant. Along this line of sight, we detect three distinct groups of young stars. Two of them, at distances of ~2.5 and ~6.0kpc, belong to the Carina spiral arm, which is traversed twice in this particular direction. Interestingly, the latter is detected for the first time. The third group, at a distance of ~12.7kpc, is probably related to the Perseus arm which lies beyond the Carina arm, and constitutes the first optical detection of this arm in the fourth Galactic quadrant. The position of this feature is consistent with both HI observations and model predictions. We also present evidence that this extremely distant group, formerly assumed to be a star cluster (Shorlin 1), is a diffuse, young population, typically found in spiral galaxies. In addition, our data-set does not support, as claimed in the literature, the possible presence of the Monoceros Ring in this direction. This study highlights how multicolor optical studies can be effective in probing the spiral structure of the outer Galactic disk. More fields need to be studied in this region of the Galaxy to constrain the spiral structure in the fourth Galactic quadrant more accurately, in particular, the shape and extent of the Perseus arm, and, possibly, to detect the even more distant Norma-Cygnus arm.