- ID:
- ivo://CDS.VizieR/J/AJ/150/175
- Title:
- YSOVAR: infrared photometry in NGC 1333
- Short Name:
- J/AJ/150/175
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- As part of the Young Stellar Object VARiability (YSOVAR) program, we monitored NGC 1333 for ~35 days at 3.6 and 4.5{mu}m using the Spitzer Space Telescope. We report here on the mid-infrared variability of the point sources in the ~10'x~20' area centered on 03:29:06, +31:19:30 (J2000). Out of 701 light curves in either channel, we find 78 variables over the YSOVAR campaign. About half of the members are variable. The variable fraction for the most embedded spectral energy distributions (SEDs) (Class I, flat) is higher than that for less embedded SEDs (Class II), which is in turn higher than the star-like SEDs (Class III). A few objects have amplitudes (10-90th percentile brightness) in [3.6] or [4.5]>0.2mag; a more typical amplitude is 0.1-0.15mag. The largest color change is >0.2mag. There are 24 periodic objects, with 40% of them being flat SED class. This may mean that the periodic signal is primarily from the disk, not the photosphere, in those cases. We find 9 variables likely to be "dippers", where texture in the disk occults the central star, and 11 likely to be "bursters", where accretion instabilities create brightness bursts. There are 39 objects that have significant trends in [3.6]-[4.5] color over the campaign, about evenly divided between redder-when-fainter (consistent with extinction variations) and bluer-when-fainter. About a third of the 17 Class 0 and/or jet-driving sources from the literature are variable over the YSOVAR campaign, and a larger fraction (~half) are variable between the YSOVAR campaign and the cryogenic-era Spitzer observations (6-7 years), perhaps because it takes time for the envelope to respond to changes in the central source. The NGC 1333 brown dwarfs do not stand out from the stellar light curves in any way except there is a much larger fraction of periodic objects (~60% of variable brown dwarfs are periodic, compared to ~30% of the variables overall).
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Search Results
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/YSOVAR/YSOVAR_I20050LC
- Title:
- YSOVAR IRAS 20050+2720 Light Curve Table
- Short Name:
- YSOVAR_I20050LC
- Date:
- 01 Oct 2018 20:27:19
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The YSOVAR (Young Stellar Object VARiability) Spitzer Space Telescope observing program obtained the first extensive mid-infrared (IRAC 3.6 and 4.5 micron) time series photometry of the Orion Nebula Cluster plus smaller fields in 11 other star-forming cores (AFGL 490, NGC 1333, Mon R2, GGD 12-15, NGC 2264, L1688, Serpens Main, Serpens South, IRAS 20050+2720, IC 1396A, and Ceph C). There are ~29,000 unique objects with light curves in either or both IRAC channels in the YSOVAR data set. YSOVAR is a sister project to the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264; Cody et al. 2014). Initial YSOVAR results were described in Morales-Calderon et al. (2011). Rebull et al. (2014) describes the details of target selection, data reduction, and other conventions established for this project.
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/YSOVAR/YSOVAR_I20050Obj
- Title:
- YSOVAR IRAS 20050+2720 Object Table
- Short Name:
- YSOVAR_I20050Obj
- Date:
- 01 Oct 2018 20:27:19
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The YSOVAR (Young Stellar Object VARiability) Spitzer Space Telescope observing program obtained the first extensive mid-infrared (IRAC 3.6 and 4.5 micron) time series photometry of the Orion Nebula Cluster plus smaller fields in 11 other star-forming cores (AFGL 490, NGC 1333, Mon R2, GGD 12-15, NGC 2264, L1688, Serpens Main, Serpens South, IRAS 20050+2720, IC 1396A, and Ceph C). There are ~29,000 unique objects with light curves in either or both IRAC channels in the YSOVAR data set. YSOVAR is a sister project to the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264; Cody et al. 2014). Initial YSOVAR results were described in Morales-Calderon et al. (2011). Rebull et al. (2014) describes the details of target selection, data reduction, and other conventions established for this project.
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/YSOVAR/YSOVAR_L1688_LC
- Title:
- YSOVAR L1688 Light Curve Table
- Short Name:
- YSOVAR_L1688_LC
- Date:
- 01 Oct 2018 20:27:19
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The YSOVAR (Young Stellar Object VARiability) Spitzer Space Telescope observing program obtained the first extensive mid-infrared (IRAC 3.6 and 4.5 micron) time series photometry of the Orion Nebula Cluster plus smaller fields in 11 other star-forming cores (AFGL 490, NGC 1333, Mon R2, GGD 12-15, NGC 2264, L1688, Serpens Main, Serpens South, IRAS 20050+2720, IC 1396A, and Ceph C). There are ~29,000 unique objects with light curves in either or both IRAC channels in the YSOVAR data set. YSOVAR is a sister project to the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264; Cody et al. 2014). Initial YSOVAR results were described in Morales-Calderon et al. (2011). Rebull et al. (2014) describes the details of target selection, data reduction, and other conventions established for this project.
24185. YSOVAR L1688 Object Table
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/YSOVAR/YSOVAR_L1688_Obj
- Title:
- YSOVAR L1688 Object Table
- Short Name:
- YSOVAR_L1688_Obj
- Date:
- 01 Oct 2018 20:27:19
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The YSOVAR (Young Stellar Object VARiability) Spitzer Space Telescope observing program obtained the first extensive mid-infrared (IRAC 3.6 and 4.5 micron) time series photometry of the Orion Nebula Cluster plus smaller fields in 11 other star-forming cores (AFGL 490, NGC 1333, Mon R2, GGD 12-15, NGC 2264, L1688, Serpens Main, Serpens South, IRAS 20050+2720, IC 1396A, and Ceph C). There are ~29,000 unique objects with light curves in either or both IRAC channels in the YSOVAR data set. YSOVAR is a sister project to the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264; Cody et al. 2014). Initial YSOVAR results were described in Morales-Calderon et al. (2011). Rebull et al. (2014) describes the details of target selection, data reduction, and other conventions established for this project.
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/YSOVAR/YSOVAR_NGC1333LC
- Title:
- YSOVAR NGC 1333 Light Curve Table
- Short Name:
- YSOVAR_NGC1333LC
- Date:
- 01 Oct 2018 20:27:19
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The YSOVAR (Young Stellar Object VARiability) Spitzer Space Telescope observing program obtained the first extensive mid-infrared (IRAC 3.6 and 4.5 micron) time series photometry of the Orion Nebula Cluster plus smaller fields in 11 other star-forming cores (AFGL 490, NGC 1333, Mon R2, GGD 12-15, NGC 2264, L1688, Serpens Main, Serpens South, IRAS 20050+2720, IC 1396A, and Ceph C). There are ~29,000 unique objects with light curves in either or both IRAC channels in the YSOVAR data set. YSOVAR is a sister project to the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264; Cody et al. 2014). Initial YSOVAR results were described in Morales-Calderon et al. (2011). Rebull et al. (2014) describes the details of target selection, data reduction, and other conventions established for this project.
24187. YSOVAR NGC 1333 Object Table
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/YSOVAR/YSOVARNGC1333Obj
- Title:
- YSOVAR NGC 1333 Object Table
- Short Name:
- YSOVARNGC1333Obj
- Date:
- 01 Oct 2018 20:27:19
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The YSOVAR (Young Stellar Object VARiability) Spitzer Space Telescope observing program obtained the first extensive mid-infrared (IRAC 3.6 and 4.5 micron) time series photometry of the Orion Nebula Cluster plus smaller fields in 11 other star-forming cores (AFGL 490, NGC 1333, Mon R2, GGD 12-15, NGC 2264, L1688, Serpens Main, Serpens South, IRAS 20050+2720, IC 1396A, and Ceph C). There are ~29,000 unique objects with light curves in either or both IRAC channels in the YSOVAR data set. YSOVAR is a sister project to the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264; Cody et al. 2014). Initial YSOVAR results were described in Morales-Calderon et al. (2011). Rebull et al. (2014) describes the details of target selection, data reduction, and other conventions established for this project.
- ID:
- ivo://CDS.VizieR/J/ApJ/753/149
- Title:
- YSOVAR: six eclipsing binaries in Orion
- Short Name:
- J/ApJ/753/149
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Eclipsing binaries (EBs) provide critical laboratories for empirically testing predictions of theoretical models of stellar structure and evolution. Pre-main-sequence (PMS) EBs are particularly valuable, both due to their rarity and the highly dynamic nature of PMS evolution, such that a dense grid of PMS EBs is required to properly calibrate theoretical PMS models. Analyzing multi-epoch, multi-color light curves for ~2400 candidate Orion Nebula Cluster (ONC) members from our Warm Spitzer Exploration Science Program YSOVAR, we have identified 12 stars whose light curves show eclipse features. Four of these 12 EBs are previously known. Supplementing our light curves with follow-up optical and near-infrared spectroscopy, we establish two of the candidates as likely field EBs lying behind the ONC. We confirm the remaining six candidate systems, however, as newly identified ONC PMS EBs. These systems increase the number of known PMS EBs by over 50% and include the highest mass ({theta}^1^ Ori E, for which we provide a complete set of well-determined parameters including component masses of 2.807 and 2.797M_{sun}_) and longest-period (ISOY J053505.71-052354.1, P~20 days) PMS EBs currently known. In two cases ({theta}^1^ Ori E and ISOY J053526.88-044730.7), enough photometric and spectroscopic data exist to attempt an orbit solution and derive the system parameters. For the remaining systems, we combine our data with literature information to provide a preliminary characterization sufficient to guide follow-up investigations of these rare, benchmark systems.
- ID:
- ivo://CDS.VizieR/J/A+AS/118/239
- Title:
- Yunnan Observatory photoelectric astrolabe catalogue
- Short Name:
- J/A+AS/118/239
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The positions of 53 FK5, 70 FK5 Extension and 486 GC stars are given for equator and the equinox J2000.0 and for the mean observation epoch of each star which are determined with the photoelectric astrolabe of Yunnan Observatory. The internal mean errors in right ascension and declination are 0.046" and 0.059", respectively. The mean observation epoch is 1989.51.
- ID:
- ivo://CDS.VizieR/J/PASP/124/411
- Title:
- YY Cet UBV differential light curves
- Short Name:
- J/PASP/124/411
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- YY Cet is a 10.5 mag semidetached variable with a 19 hr orbital period. The Wilson-Devinney program is used to simultaneously solve two new sets of UBV light curves together with preexisting photometry and single-line radial velocity measurements . The system has the lower-mass component completely filling its Roche lobe. The resulting masses are M1=1.78+/-0.19M_{sun}_ and M2=0.92+/-0.10M_{sun}_, and the radii are R1=2.08+/-0.08R_{sun}_ and R2=1.62+/-0.06R_{sun}_. Its computed distance is 534+/-28pc. Light- and velocity-curve parameters, orbital elements, and absolute dimensions are presented. A study of published TOM observations indicates that the period changed around 1999.
