- ID:
- ivo://CDS.VizieR/J/ApJ/649/862
- Title:
- IR phot. of IC 348 pre-main-sequence stars
- Short Name:
- J/ApJ/649/862
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 105 stellar rotation periods in the young cluster IC 348, 75 of which are new detections, increasing the total number of known periods in this cluster to 143. The period distribution resembles that seen in the heart of the Orion Nebula cluster by Herbst and colleagues. Stars estimated to be less massive than 0.25M_{sun}_ show a unimodal distribution of fast rotators (P~1-2days) and a tail of slower rotators, while stars estimated to be more massive than 0.25M_{sun}_ show a bimodal distribution with peaks at 2 and 8-days. We combine all published rotation periods in IC 348 with Spitzer mid-IR (3.6, 4.5, 5.8, and 8.0um) photometry, an unprecedentedly efficient and reliable disk indicator, in order to test the disk-braking paradigm.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/471/813
- Title:
- IR photometry around IRAS 16571-4029
- Short Name:
- J/A+A/471/813
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a near-infrared survey of the young stellar cluster associated with the IRAS 16571-4029 source. The main purpose of this survey is to study the cluster members and find the ionizing sources of the associated HII region.
- ID:
- ivo://CDS.VizieR/J/ApJ/758/31
- Title:
- IR photometry for members of Upper Sco
- Short Name:
- J/ApJ/758/31
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present photometry at 3-24{mu}m for all known members of the Upper Scorpius association ({tau}~11Myr) based on all images of these objects obtained with the Spitzer Space Telescope and the Wide-field Infrared Survey Explorer. We have used these data to identify the members that exhibit excess emission from circumstellar disks and estimate the evolutionary stages of these disks. Through this analysis, we have found ~50 new candidates for transitional, evolved, and debris disks. The fraction of members harboring inner primordial disks is <~10% for B-G stars (M>1.2M_{sun}_) and increases with later types to a value of ~25% at >~M5 (M<~0.2 M_{sun}_), in agreement with the results of previous disk surveys of smaller samples of Upper Sco members. These data indicate that the lifetimes of disks are longer at lower stellar masses and that a significant fraction of disks of low-mass stars survive for at least ~10Myr. Finally, we demonstrate that the distribution of excess sizes in Upper Sco and the much younger Taurus star-forming region ({tau}~1Myr) is consistent with the same, brief timescale for clearing of inner disks.
- ID:
- ivo://CDS.VizieR/J/ApJ/686/1195
- Title:
- IR photometry in the {gamma} Vel cluster
- Short Name:
- J/ApJ/686/1195
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new Spitzer Space Telescope observations of stars in the young (~5Myr) {gamma} Velorum stellar cluster. Combining optical and 2MASS photometry, we have selected 579 stars as candidate members of the cluster. With the addition of the Spitzer mid-infrared data, we have identified five debris disks around A-type stars and five to six debris disks around solar-type stars, indicating that the strong radiation field in the cluster does not completely suppress the production of planetesimals in the disks of cluster members. However, we find some evidence that the frequency of circumstellar primordial disks is lower, and the infrared flux excesses are smaller than for disks around stellar populations with similar ages.
- ID:
- ivo://CDS.VizieR/J/ApJ/638/897
- Title:
- IR photometry in Trumpler 37 and NGC 7160
- Short Name:
- J/ApJ/638/897
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of an infrared imaging survey of two clusters in the Cep OB2 Association, Tr 37 and NGC 7160, using the IRAC and MIPS instruments on board the Spitzer Space Telescope. Our observations cover the wavelength range from 3.6 to 24{mu}m, allowing us to detect disk emission over a typical range of radii ~0.1 to ~20AU from the central star.
- ID:
- ivo://CDS.VizieR/J/ApJ/642/972
- Title:
- IR photometry of a star-forming core in NGC 2264
- Short Name:
- J/ApJ/642/972
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We analyze Spitzer and Magellan observations of a star-forming core near IRS 2 in the young cluster NGC 2264. The submillimeter source IRAS 12 S1, previously believed to be an intermediate-mass Class 0 object is shown to be a dense collection of embedded, low-mass stars. We argue that this group of stars represents the fragmenting collapse of a dense, turbulent core, using a number of indicators of extreme youth. With reasonable estimates for the velocity dispersion in the group, we estimate a dynamical lifetime of only a few times 10^4^yr. Spectral energy distributions of stars in the core are consistent with Class I or Class 0 assignments. We present observations of an extensive system of molecular hydrogen emission knots. The luminosity of the objects in the core region are consistent with roughly solar mass protostars.
- ID:
- ivo://CDS.VizieR/J/ApJ/597/555
- Title:
- IR photometry of IC 348 young brown dwarfs
- Short Name:
- J/ApJ/597/555
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of a population of young brown dwarf candidates in the open star cluster IC 348 and the development of a new spectroscopic classification technique using narrowband photometry. Observations were made using FLITECAM, the First Light Camera for SOFIA, at the 3m Shane telescope at Lick Observatory. FLITECAM is a new 1-5{mu}m camera with an 8' field of view. Custom narrowband filters were developed to detect absorption features of water vapor (at 1.495{mu}) and methane (at 1.66{mu}m) characteristic of brown dwarfs. These filters enable spectral classification of stars and brown dwarfs without spectroscopy.
- ID:
- ivo://CDS.VizieR/J/AJ/151/146
- Title:
- IRS spectra with features of crystalline silicates
- Short Name:
- J/AJ/151/146
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The crystalline silicate features are mainly reflected in infrared bands. The Spitzer Infrared Spectrograph (IRS) collected numerous spectra of various objects and provided a big database to investigate crystalline silicates in a wide range of astronomical environments. We apply the manifold ranking algorithm to perform a systematic search for the spectra with crystalline silicate features in the Spitzer IRS Enhanced Products available. In total, 868 spectra of 790 sources are found to show the features of crystalline silicates. These objects are cross-matched with the SIMBAD database as well as with the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST)/DR2 (Luo et al. 2016, Cat. V/149). The average spectrum of young stellar objects shows a variety of features dominated either by forsterite or enstatite or neither, while the average spectrum of evolved objects consistently present dominant features of forsterite in AGB, OH/IR, post-AGB, and planetary nebulae. They are identified optically as early-type stars, evolved stars, galaxies and so on. In addition, the strength of spectral features in typical silicate complexes is calculated. The results are available through CDS for the astronomical community to further study crystalline silicates.
- ID:
- ivo://CDS.VizieR/J/A+A/401/613
- Title:
- ISOCAM-CVF spectroscopy of YSO environment
- Short Name:
- J/A+A/401/613
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a mid-infrared (5-16.5{mu}m) imaging spectroscopy survey of Young Stellar Objects (YSOs) and their surrounding environment in four low-mass star formation regions: R CrA, {rho} Ophiuchi, Serpens and Chamaeleon I. This survey was performed using ISOCAM and its Circular Variable Filters (CVF) and observed 42 YSO candidates: we were able to obtain complete 5-16.5{mu}m spectra for 40 of these with a spectral resolving power of {lambda}/{Delta}{lambda}~40.
- ID:
- ivo://CDS.VizieR/J/A+A/357/219
- Title:
- ISOCAM observations in Cha I.
- Short Name:
- J/A+A/357/219
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of an ISOCAM survey of the Chamaeleon I dark cloud conducted in two broad-band filters at 6.7 and 14.3{mu}m. In an area of 0.59deg^2^. we have detected a total of 282 mid-IR sources with 103 sources observed in both filters. Combining the ISOCAM observations with the I, J, and K_s_ data obtained with DENIS, we have found 108 pre-main-sequence (PMS) stars in the region, of which 34 were previously unidentified. Several of these newly discovered young stellar objects are relatively faint suggesting a population in Cha I of very low mass objects that probably includes brown dwarfs in their early contraction phases. Finally, most of the PMS stars show the spectral index computed between 2.2 and 14.3{mu}m typical of Class II sources. The luminosity function (LF) derived for our detected PMS stars is discussed.
