Zobrazeno 1 - 10
of 150
pro vyhledávání: '"Anne P. Cowley"'
Publikováno v:
Research Notes of the AAS. 5:130
We present V and I photometry for the Be/X-ray binary Swift J010745.0-722740 taken in 1997–2020. The data show recurring outbursts, with an amplitude up to 0.4 mag and an improved orbital period of 1180.0 ± 0.3 days. The light curve during outburs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5d02775bc9590e14c44b549e82cfca5
https://doi.org/10.3847/2515-5172/ac0640
https://doi.org/10.3847/2515-5172/ac0640
Publikováno v:
The Astronomical Journal. 135:1350-1360
In a sample of 150 hot stars in NGC 330, a SMC cluster containing a high fraction of Be stars, we searched for photometric variables using OGLE II data. At least one third of all stars are variable, with 38 being periodic. We found 27 pulsators (λ E
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a60b0660ee8ffde42d88b0956fcd774a
https://doi.org/10.1088/0004-6256/135/4/1350
https://doi.org/10.1088/0004-6256/135/4/1350
Publikováno v:
The Astronomical Journal. 127:3388-3393
The long-term photometric behavior of seven Be–neutron star binaries in the Magellanic Clouds has been examined using MACHO and OGLE-II data. All show small periodic outbursts, which we associate with the periastron passage of the neutron star and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88ae580149c975512f6fd39ce409c99a
https://doi.org/10.1086/420990
https://doi.org/10.1086/420990
Publikováno v:
The Astronomical Journal. 126:2368-2371
Far-ultraviolet spectra of LMC X-3 were taken covering photometric phases 0.47 to 0.74 in the 1.7-day orbital period of the black-hole binary (phase zero being superior conjunction of the X-ray source). The continuum is faint and flat, but appears to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70aac2daeef5d0564baba5928a5d5f6d
https://doi.org/10.1086/378606
https://doi.org/10.1086/378606
Publikováno v:
The Astronomical Journal. 126:1017-1022
We have analyzed over 6 years of MACHO optical photometry and a smaller amount of OGLE-II data for the X-ray/Be star source RX J0058.2-7231, in the Small Magellanic Cloud. The brightness is clearly modulated with a 60 day period. During this period,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3e6395bc634a09b301224077c553fd15
https://doi.org/10.1086/376746
https://doi.org/10.1086/376746
Publikováno v:
The Astronomical Journal. 124:2233-2237
We have analyzed nearly eight years of MACHO optical photometry of the supersoft X-ray binary RX J0513.9-6951 and derived a revised orbital period and ephemeris. Previously published velocities are reinterpreted using the new ephemeris. We show that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::022e086f2c5ec9daf4e5ccd961dbd49e
https://doi.org/10.1086/342852
https://doi.org/10.1086/342852
Publikováno v:
The Astronomical Journal. 123:3210-3215
A weak X-ray source (CAL 86=RX J0546.3-6836) in the direction of the Large Magellanic Cloud has been identified with a faint, Galactic cataclysmic variable (CV). Photometry and spectroscopy obtained at Cerro Tololo Inter-American Observatory reveal a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3822511c74aed95be0937a7e09776580
https://doi.org/10.1086/340698
https://doi.org/10.1086/340698
Publikováno v:
The Astronomical Journal. 123:1741-1749
GX 339-4 has long been known as a black hole candidate because of its rapid variability and high/low X-ray states, which are similar to those of Cyg X-1. Although GX 339-4 is assumed to be a binary, the orbital period has not yet been convincingly de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d03acf54ba5ca672ead24e3b3d241484
https://doi.org/10.1086/339028
https://doi.org/10.1086/339028
Publikováno v:
The Astronomical Journal. 122:1572-1577
Far-Ultraviolet Spectroscopic Explorer spectra were obtained of the supersoft X-ray binary RX J0019.8+2156 (QR And) during 16 consecutive spacecraft orbits, covering the binary orbit (P = 15.85 hr) with about 0.2 phase overlap. The spectrum is domina
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed66fe35fcb382783e18316aee81417d
https://doi.org/10.1086/322114
https://doi.org/10.1086/322114
Publikováno v:
The Astronomical Journal. 122:1578-1585
Simultaneous optical photometry and spectroscopy of QR Andromedae (RX J0019.8+2156) obtained in 1995 are reported. The V light curve shows a range of ~0.5 mag through the 15.85 hr orbital period, with shorter term (~1.8 hr) variations superposed. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::581ab9b4da1a00921e5095e321b31e3d
https://doi.org/10.1086/322109
https://doi.org/10.1086/322109