A5042106522- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- History and Developments in Astronomy
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Infrared Target Detection Methodologies
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Phase Equilibria and Thermodynamics
- Urbanization and City Planning
- 3D Surveying and Cultural Heritage
- Image Processing Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Tribology and Lubrication Engineering
- Spectroscopy Techniques in Biomedical and Chemical Research
- Impact of Light on Environment and Health
- Optical measurement and interference techniques
- Material Science and Thermodynamics
- Image and Object Detection Techniques
- Color Science and Applications
Boston University
2006-2023
Center for Astrophysics Harvard & Smithsonian
1984-1994
Kitt Peak National Observatory
1984
We present radial velocities and metallicities for a sample of 39 open clusters with ages greater than about 700 million years. For 24 new moderate-resolution spectroscopic data obtained multiobject spectrographs on the Kitt Peak National Observatory Cerro Tololo Inter-American 4 m telescopes are used to determine mean cluster metallicities. These results combined published previously by Friel & Janes provide 459 giants in old clusters, which investigate abundance gradients Galactic disk....
We present a CCD photometric survey of the central one-half degree old open cluster, M67, in U, B, V, and I colors to magnitude V = 20. Extensive comparison our photometry with other published datasets shows excellent agreement, indicating that is capable producing uniform set measurements consistent system defined primarily by Landolt standard sequence. The color-magnitude diagram cluster well-defined main sequence extending at least limit M(V) 10.55 substantial binary At 38 percent stars...
We present rotation periods for 71 single dwarf members of the open cluster NGC6811 determined using photometry from NASA's Kepler Mission. The results are first Cluster Study which combine Kepler's with ground-based spectroscopy membership and binarity. delineate a tight sequence in color-period diagram ~1 day at mid-F to ~11 days early-K spectral type. This result extends Gyr similar prior ~600 Myr Hyades Praesepe clusters, suggesting that cool stars well-defined surface 3-dimensional...
The vast majority of open clusters persist as for no more than a few hundred million years, but the which survive much longer periods constitute unique sample probing evolution galactic disk. In charge coupled device (CCD) photometric survey possible old combined with previously published photometry, we have developed list 72 age Hyades or older (Phelps (1994). Using our version parameters based on luminosity difference between main sequence turnoff and horizontal branch color giant branch,...
The XO project's first objective is to find hot Jupiters transiting bright stars (i.e., V<12) by precision differential photometry. Two cameras have been operating since 2003 September on the 10,000 foot Haleakala summit Maui. Each camera consists of a 200 mm f/1.8 lens coupled 1024 × pixel, thinned CCD operated drift‐scanning. In its year routine operation, has observed 6.6% sky within six 7° wide strips scanned from 0° +63° declination and centered at R.A. = 0, 4, 8, 12, 16, 20 hr....
We report on a V = 11.2 early K dwarf, XO-2 (GSC 03413-00005), that hosts Rp 0.98±0.010.03 RJ, Mp 0.57 ± 0.06 MJ transiting extrasolar planet, XO-2b, with an orbital period of 2.615857 0.000005 days. has high metallicity, [Fe/H ] 0.45 0.02, proper motion, μtot 157 mas yr−1, and common motion stellar companion 31'' separation. The two stars are nearly identical twins, very similar spectra apparent magnitudes. Due to the these dwarf have mass radius close solar, M⋆ 0.98 0.02 M☉ R⋆...
view Abstract Citations (317) References (69) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evidence for an abundance gradient in the galactic disk. Janes, K. A. DDO photometry of field K giants distant parts disk center and anticenter directions is used together with UBV 41 open clusters to investigate variation metallicity across Some problems calibration are examined, observations analyzed. The data shown be consistent suggestion that there a composition...
We report the discovery of a massive (Mpsini = 13.02 +/- 0.64 Mjup; total mass 13.25 Mjup), large (1.95 0.16 Rjup) planet in transiting, eccentric orbit (e 0.260 0.017) around 10th magnitude F5V star constellation Camelopardalis. designate XO-3b, and XO-3, also known as GSC 03727-01064. The orbital period XO-3b is 3.1915426 0.00014 days. XO-3 lacks trigonometric distance; we estimate its distance to be 260 23 pc. radius 2.13 0.21 Rsun, 1.41 0.08 Msun, vsini 18.54 0.17 km/s, metallicity...
view Abstract Citations (231) References (211) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Open clusters and galactic structure. Janes, K. ; Adler, D. A total of 610 references to 434 are employed in the compilation a catalog open with color-magnitude diagrams on UBV or RGU systems. Estimates reddening, distance modulus, age number cluster members included. Although sample is considered representative discoverable galaxy, observed distribution nonuniform...
In an extensive charge coupled devices (CCD) photometric survey of potential old open clusters, we have identified a number systems that are indeed old; some them among the oldest clusters. Using our versions two well-known morphological age indices, one based on luminosity difference between main sequence turnoff and horizontal branch other color giant branch, ranked clusters in approximate order age. Our data together with previously published photometry yields catalogue 72 Hyades or older...
A planet transits an 11th magnitude, G1V star in the constellation Corona Borealis. We designate XO-1b, and star, XO-1, also known as GSC 02041-01657. XO-1 lacks a trigonometric distance; we estimate it to be 200+-20 pc. Of ten stars currently host extrasolar transiting planets, is most similar Sun its physical characteristics: radius 1.0+-0.08 R_Sun, mass 1.0+-0.03 M_Sun, V sini < 3 km/s, metallicity [Fe/H] 0.015+-0.04. The orbital period of XO-1b 3.941534+-0.000027 days, one longer ones...
view Abstract Citations (111) References (91) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Young Open Clusters as Probes of the Star Formation Process. I. an Atlas Cluster Photometry Phelps, Randy L. ; Janes, Kenneth A. We have obtained charge coupled device (CCD) photometry, in UBV system, for 23 open clusters order to explore star formation history Cassiopeia region Perseus spiral arm our Galaxy. Magnitudes and colors 35,788 stars were measured, making...
A system of weigths corresponding to the precision open cluster data is described. Using these weights, some properties clusters can be studied more accurately than was possible earlier. It clear that there are three types objects: unbound clusters, bound in thin disk, and older clusters. Galactic gradients metallicity, longevity, linear diameter studied. Distributions at right angles galactic plane discussed light different types. The clumping complexes An estimate selection effects...
view Abstract Citations (147) References (95) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Luminosity Scale of RR Lyrae Stars with the Baade-Wesselink Method. II. Absolute Magnitudes 13 Field Liu, Tianxing ; Janes, Kenneth A. surface brightness version method has been applied to field stars derive their absolute magnitudes from photometry and radial velocities presented in a previous paper. Using static model atmospheres provide metallicity-...
The star XO-5 (GSC 02959-00729, V=12.1, G8V) hosts a Jupiter-sized, Rp=1.15+/-0.12 Rjup, transiting extrasolar planet, XO-5b, with an orbital period of P=4.187732+/-0.00002 days. planet mass (Mp=1.15+/-0.08 Mjup) and surface gravity (gp=22+/-5 m/s^2) are significantly larger than expected by empirical Mp-P Mp-P-[Fe/H] relationships. However, the deviation from relationship for XO-5b is not large enough to suggest distinct type as suggested GJ 436b, HAT-P-2b, XO-3b. By coincidence overlies...
We have catalogued important optical data and collected a bibliography for all quasars with redshifts published prior to May or june 1971, including objects only one spectral line. References identifications, alternate designations, photometry, redshifts, proper motions, variability, spectrophotometry, polarization measurements are given. Key words: quasar catalog -
view Abstract Citations (89) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS An RR LYR star survey with the Lick 20-inch. astrograph. IV. A surveyof 3 fields near North galactic pole. Kinman, T. D. ; Wirtanen, C. A. Janes, K. Photometric data, positions, and finding charts are given for fifty-four variables in three astrograph covering 74 square degrees north The magnitude range 12.7 <m= < 18.4 is judged to be essentially complete Lyrae...
Ages and distance moduli for the open clusters NGC 2204, Berkeley 39, 2477, Melotte 66 are constrained by comparing theoretical models developed Bertelli et al. (1994, A&A, 106, 235) to observed cluster color-magnitude diagrams which based on deep CCD photometry. Out of a set comparison models, no single isochrone was superior others in describing an diagram. Thus, best fitting model selected not only match diagram, but also isochrone's agreement with adopted values cluster's metallicity...
We refine the physical parameters of transiting hot Jupiter planet XO-1b and its stellar host XO-1 using Hubble Space Telescope (HST) NICMOS observations. has a radius Rp = 1.21 ± 0.03 RJ, R⋆ 0.94 0.02 R☉, where uncertainty in mass dominates R⋆. There are no significant differences system properties between these broadband NIR observations previous determinations based upon ground-based optical measure two transit timings from with 9 s 15 precision. As residual to linear ephemeris model,...
view Abstract Citations (61) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS An RR LYR star survey with the Lick 20-inch astrograph. III. A surveyof part of variable field MWF 361. Kinman, T. D. ; Wirtanen, C. A. Janes, K. Photometric data, positions, and finding charts are given for seventy-seven variables or suspected in a (MWF 361A) centered on l6b22 , - ' (1900) covering 27.3 square degrees. Six these have periods greater than 1 day;...
We have used the Two Micron All Sky Survey and Palomar Observatory photographic plates, digitized by US Naval Observatory's Precision Measuring Machine program, to derive proper motions over a 100 square degree, spatially complete region centered on Praesepe open cluster. Proper-motion measurements spanned magnitude range R ∼ 12–19, which covers most of lower main sequence in Praesepe. The incidence Hα emission from moderate-resolution (∼2600), red spectroscopy 434 faint candidate members...
This paper is the second in a series devoted to use of young, optically revealed open clusters as probes star-formation process. The first presented dataset used for study, and discussed some results from survey 23 Cassiopeia region Perseus spiral arm our Galaxy. presents an analysis stellar content subset clusters, including determinations luminosity mass functions 8 approximately 1 solar mass. slope average function Gamma found be -1.40 +/- 0.13 over range 1.4 less than M/solar 7.9....