- ID:
- ivo://CDS.VizieR/J/A+A/361/660
- Title:
- JHK photometry around S233IR
- Short Name:
- J/A+A/361/660
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Observed properties of sources in the region S233IR in a field of 3.1 arcmin by 3.1 arcmin, which contains two young stellar clusters located to the northeast (NE) and southwest (SW) of the field center (RA = 05 35 49.79, DE = +35 44 01.9). Source positions, JHK photometry, extinction and estimated stellar mass are provided.
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Search Results
- ID:
- ivo://CDS.VizieR/J/AJ/110/2788
- Title:
- JHK photometry for Galactic bulge stars
- Short Name:
- J/AJ/110/2788
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present deep near-IR photometry for Galactic bulge stars in Baade's Window, (l, b)=(1.0deg, -3.9deg), and another minor axis field at (l, b)=(0deg, -6deg). We combine our data with previously published photometry and construct a luminosity function over the range 5.5=<K0=<16.5, deeper than any previously published. The slope of this luminosity function and the magnitude of the tip of the first ascent giant branch are consistent with theoretical values derived from isochrones with appropriate age and metallicity. We use the relationship between [Fe/H] and the giant branch slope derived from near-IR observations of metal-rich globular clusters by Kuchinski et al. (1995AJ....109.1131K) to calculate the mean metallicity for several bulge fields along the minor axis.
- ID:
- ivo://CDS.VizieR/J/MNRAS/365/439
- Title:
- JHK photometry for UKIRT faint galaxies
- Short Name:
- J/MNRAS/365/439
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a multicolour catalogue of faint galaxies situated close to bright stars, V<15, with the aim of identifying high-redshift galaxies suitable for study with adaptive optics-equipped near-infrared imagers and spectrographs. The catalogue is constructed from archival calibration observations of the United Kingdom Infrared Telescope (UKIRT) Faint Standard stars with the UKIRT Fast Track Imager (UFTI) camera on UKIRT. We have analysed the deepest 16 fields from the archive to provide a catalogue of galaxies brighter than K~20.3 lying between 3 and 25-arcsec of the guide stars. We identify 111 objects in a total survey area of 8.7arcmin^2^. Of these, 87 are classified as galaxies based on their light profiles in our ~0.5arcsec median seeing K-band images. 12 of the galaxies have (J-K)>~2.0 consistent with them lying at high redshifts, z>~2. These 12 very red galaxies have K-band magnitudes of K=18.1-20.1 and separations from the guide stars of 4-20arcsec and hence are very well suited to adaptive optics studies to investigate their morphologies and spectral properties on sub-kpc scales. We provide coordinates and JHK photometry for all catalogued objects.
3134. JHK photometry in Cha I
- ID:
- ivo://CDS.VizieR/J/AJ/121/974
- Title:
- JHK photometry in Cha I
- Short Name:
- J/AJ/121/974
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We describe a near-infrared imaging survey covering ~1deg^2^ of the Chamaeleon I dark cloud. The survey is complete for K<15.0, H<16.0, and J<16.5, roughly 2 magnitudes more sensitive than previous large-scale surveys. We use the large number of background stars detected to derive an accurate near-infrared extinction law for the cloud and select new candidate members with near-infrared color excesses. We list ~100 candidates of the cloud with K>=2.0, based on their positions in the J-H, H-K color-color diagram. These new stars have low luminosities (K~12-16, H-K>~0.5-1.5) and may have masses close to or even below the hydrogen-burning limit.
- ID:
- ivo://CDS.VizieR/J/PASP/120/150
- Title:
- JHK photometry in Cluster [BDS2003] 107
- Short Name:
- J/PASP/120/150
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new near-infrared classification spectra for nine candidate members of the galactic cluster [BDS2003] 107 (Cluster 107) observed with the IRTF SpeX instrument. We can spectroscopically classify at least three members, two of which have published 2MASS photometry. These two stars provide preliminary values for the approximate age (10^6^yr), distance (<=2kpc), and extinction (A_V_~23) of the young cluster. Based on the properties of the brightest members we have identified, on the surface Cluster 107 appears to be very similar to the well-studied Orion cluster. We find a single mid-O dwarf star and a number of early-B stars, along with massive young stellar objects (YSOs) in the field. The massive YSO Star 63 shows simultaneously an early-B spectral classification in the short K-band with CO band-head emission at 2.3um. This massive YSO looks similar to other luminous CO emission objects seen in young, massive clusters through out the Galaxy and provides additional evidence for the existence of circumstellar disks around even fairly massive stars. Several previously identified radio sources, presumably associated with very early star formation, lie within this field, three of which appear to have near-infrared counterparts as detected in images we obtained with the SpeX acquisition camera.
- ID:
- ivo://CDS.VizieR/J/AJ/145/113
- Title:
- JHK photometry in Cyg OB7. II. Variable stars
- Short Name:
- J/AJ/145/113
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a subset of the results of a three-season, 124 nights, near-infrared monitoring campaign of the dark clouds Lynds 1003 and Lynds 1004 in the Cygnus OB7 star-forming region. In this paper, we focus on the field star population. Using three seasons of UKIRT J, H, and K-band observations spanning 1.5 years, we obtained high-quality photometry on 9200 stars down to J=17mag, with photometric uncertainty better than 0.04mag. After excluding known disk-bearing stars we identify 149 variables-1.6% of the sample. Of these, about 60 are strictly periodic, with periods predominantly <2days. We conclude this group is dominated by eclipsing binaries. A few stars have long period signals of between 20 and 60 days. About 25 stars have weak modulated signals, but it was not clear if these were periodic. Some of the stars in this group may be diskless young stellar objects with relatively large variability due to cool starspots. The remaining ~60 stars showed variations which appear to be purely stochastic.
- ID:
- ivo://CDS.VizieR/J/MNRAS/359/2
- Title:
- JHK photometry in G173.58+2.45
- Short Name:
- J/MNRAS/359/2
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a multi-epoch infrared photometric study of the intermediate-mass star-forming region G173.58+2.45. Photometric observations are obtained using the near-infrared JHKL'M' filters and narrow-band filters centred at the wavelengths of the H_2_(1-0)S(1)(2.122um) and [FeII](1.644um) lines. The H2 image shows molecular emission from shocked gas, implying the presence of multiple star formation and associated outflow activity. We see evidence for several collimated outflows.
- ID:
- ivo://CDS.VizieR/J/other/ChA+A/28.308
- Title:
- JHK' photometry in GGD 12-15 region
- Short Name:
- J/other/ChA+A/28
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Near infrared imaging observations in JHK broad bands and H_2_ v=1-0 S(1) narrow band of the star formation region GGD12-15 are presented in this article. The images reveal young compact infrared clusters and infrared nebulae in association with infrared sources, as well as outflow activities characterized by H_2_ emission knots. Most of the infrared point sources are invisible in the optical wave band. The JHK' photometric results of 76 infrared point sources contain 32 with infrared excess, and 5 with the characteristics of protostars, indicating very active star formation activities in the molecular clouds.
- ID:
- ivo://CDS.VizieR/J/AJ/109/1131
- Title:
- JHK Photometry in Metal Rich Globulars.
- Short Name:
- J/AJ/109/1131
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- As a first step in investigating the properties of heavily reddened, metal-rich globular clusters, we present JHK colors and magnitudes for four objects: NGC 5927, NGC 6712, NGC 6838 (M71), and Terzan 2. These data begin near the top of the giant branch (GB) and extend to stars six magnitudes fainter, reaching below the horizontal branch (HB). We use our sample and previously published data for two other clusters, 47 Tucanae and M69, to develop techniques for deriving basic properties such as metallicity and distance modulus from observable parameters of cluster color-magnitude diagrams (CMDs) in the near-IR. We also analyze the horizontal branches of the clusters in an attempt to set constraints on mass loss for first-ascent giants. We find that the slope of the linear fit to the GB stars brighter than the HB can be used to predict metallicity to an accuracy of +/- 0.25 dex for clusters with [Fe/H] between -1.0 and -0.3. There appears to be no significant dependence on [Fe/H] for other reddening-free indices measured from the CMD, including the width of the HB and the separation between the GB and HB at the level of the HB. Using the clusters in our sample that have known distances, we derive a value of <M_K0(HB)> = -1.15 +/- 0.10 for the extinction-corrected absolute K magnitude of the HB. This provides a means of determining the distance to clusters for which only infrared CMDs are available. We derive a distance modulus to Terzan 2 of 14.37 +/- 0.2 which places it within a few hundred parsecs of the galactic center. In the J-H,H-K diagram, Terzan 2 giants are located near the Baade's Window giants rather than in the region populated by nearly all other globular cluster stars. The GB of stars in the field around Terzan 2 has a slope that implies [Fe/H] = +0.1, comparable to that in Baade's Window.
- ID:
- ivo://CDS.VizieR/J/A+A/316/102
- Title:
- JHK Photometry in NGC 6334
- Short Name:
- J/A+A/316/102
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- JHK imaging photometry is reported of an area of approximately 2'x3' centred on the far infrared source NGC 6334 I with limiting magnitudes J=18.3, H=17.8 and K=16.2. More than 224 sources were detected in K-band, increasing by a factor of more than seven the number of objects found in previous near-IR surveys. Most of the sources are located in an area of about 3500 square arcsec centered around the massive young stellar object Irs1, which ionizes the compact HII region NGC 6334 F. The location of these sources and the analysis of the colour-colour and colour-magnitude diagrams suggest the presence of an embedded and young stellar cluster of size ~70" (0.6pc), and stellar density of about 1200pc^-3^. The star formation efficiency is estimated to be SFE=~0.25. Only a few of the most luminous stars of the cluster were found to show large near-IR excesses but this may be due to the non-detection, at the shortest wavelength, of the majority of the highly reddened cluster members. The extinction of the region is very variable with a maximum of A_V_>70 in Irs2 while the average is <A_V_>=~40. Very close to the position of an H_2_O maser associated with NGC 6334 I(N), a contracting core at an earlier evolutionary stage, we found six very red sources, one of which is a small and diffuse nebula seen only at 2.2{mu}m. Finally, the older and developed HII region NGC 6334 E was found to be probably ionized by a small cluster of at least 12 B0-B0.5 ZAMS stars. For a description of the JHK photometric system, see e.g. <GCPD/09>
