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JHK Standard Stars on the CIT Photometric System
We present a set of 58 stars with JHK standard values on the CIT systemand with a suitable magnitude range for use with array detectors onsmall- to moderate-size telescopes. Each final value is based on six to47 measures (with a mean of 17) obtained on separate nights with the USNaval Observatory (USNO) NICMOS3 (HgCdTe) camera. The objects include 20primary CIT standards from Elias et al. and 38 secondary sourcesselected from the SAAO and UKIRT standards lists, cover a K-magnituderange between 6.0 and 10.8, and lie north of declination -20°. Thestars were reduced to the CIT system as defined by Elias et al.,producing a USNO system that is identical to the near-infrared CITsystem. This work densifies the original CIT system by nearly a factorof 3 and extends its range by about 3 mag. The SAAO and UKIRT standardsare also compared with the CIT system.
| Determination of the temperatures of selected ISO flux calibration stars using the Infrared Flux Method
Effective temperatures for 420 stars with spectral types between A0 andK3, and luminosity classes between II and V, selected for a fluxcalibration of the Infrared Space Observatory, ISO, have been determinedusing the Infrared Flux Method (IRFM). The determinations are based onnarrow and wide band photometric data obtained for this purpose, andtake into account previously published narrow-band measures oftemperature. Regression coefficients are given for relations between thedetermined temperatures and the photometric parameters (B2-V1), (b-y)and (B-V), corrected for interstellar extinction through use ofHipparcos parallaxes. A correction for the effect of metallicity on thedetermination of integrated flux is proposed. The importance of aknowledge of metallicity in the representation of derived temperaturesfor Class V, IV and III stars by empirical functions is discussed andformulae given. An estimate is given for the probable error of eachtemperature determination. Based on data from the ESA HipparcosAstrometry Satellite.
| Fainter Southern JHK Standards Suitable for Infrared Arrays
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1995MNRAS.276..734C&db_key=AST
| Negative Search for a Counterpart to the Gamma-Ray Repeater Source 0525-66
Radio continuum, near-infrared [Fe II], H2, and Br?,and optical H? images of the supernova remnant N49 in the LMC,show a filamentary shell structure, characteristic of remnants in theadolescent or middle-aged phase of their evolution. No evidence isfound in these images for any feature associated with the soft?-ray repeater 0525-66 projected within the outline of thisSNR. The nature of an X-ray hot spot located near the position of the?-ray source remains uncertain, but the lack of emission atother wavelengths places significant limits on any nonthermalcontribution to its radiation.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Balina |
| Sað Açýklýk: | 02h26m26.35s |
| Yükselim: | -13°52'47.5" |
| Görünürdeki Parlaklýk: | 9.465 |
| özdevim Sað Açýklýk: | 12.1 |
| özdevim Yükselim: | -37.8 |
| B-T magnitude: | 10.124 |
| V-T magnitude: | 9.52 |
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