Zobrazeno 1 - 10
of 61
pro vyhledávání: '"The MACHO Collaboration"'
Autor:
The Macho collaboration, Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Dalal, N., Drake, A. J., Geha, M., Griest, K., Lehner, M. J., Marshall, S. L., Minniti, D., Nelson, C. A., Peterson, B. A., Popowski, P., Pratt, M. R., Quinn, P. J., Stubbs, C. W., Sutherland, W., Tomaney, A. B., Vandehei, T., Welch, D. L.
We report on a search for long duration microlensing events towards the Large Magellanic Cloud. We find none, and therefore put limits on the contribution of high mass objects to the Galactic dark matter. At 95% confidence level we exclude objects in
Externí odkaz:
http://arxiv.org/abs/astro-ph/0011506
Autor:
The MACHO collaboration, Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Drake, A. J., Freeman, K. C., Geha, M., Griest, K., Lehner, M. J., Marshall, S. L., Minniti, D., Nelson, C. A., Peterson, B. A., Popowski, P., Pratt, M. R., Quinn, P. J., Stubbs, C. W., Sutherland, W., Tomaney, A. B., Vandehei, T., Welch, D.
The MACHO project is a search for dark matter in the form of massive compact halo objects (MACHOs). The project has photometrically monitored tens of millions of stars in the Large Magellanic Cloud (LMC), Small Magellanic Cloud (SMC), and Galactic bu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0003392
Autor:
The MACHO collaboration, Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Dalal, N., Drake, A. J., Freeman, K. C., Geha, M., Griest, K., Lehner, M. J., Marshall, S. L., Minniti, D., Nelson, C. A., Peterson, B. A., Popowski, P., Pratt, M. R., Quinn, P. J., Stubbs, C. W., Sutherland, W., Tomaney, A. B., Vandehei, T., Welch, D.
Publikováno v:
Astrophys.J. 542 (2000) 281-307
We report on our search for microlensing towards the Large Magellanic Cloud (LMC). Analysis of 5.7 years of photometry on 11.9 million stars in the LMC reveals 13 - 17 microlensing events. This is significantly more than the $\sim$ 2 to 4 events expe
Externí odkaz:
http://arxiv.org/abs/astro-ph/0001272
Autor:
The MACHO Collaboration, Welch, D. L., Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Freeman, K. C., Griest, K., Kurtz, D. W., Lehner, M. J., Marshall, S. L., Minniti, D., Peterson, B. A., Pratt, M. R., Quinn, P. J., Rodgers, A. W., Rorabeck, A., Sutherland, W., Tomaney, A., Vandehei, T.
In this paper, we will review major new results regarding classical Cepheids, in the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC). Specifically, we discuss recent work regarding multimode Cepheids and describe new observations of a W
Externí odkaz:
http://arxiv.org/abs/astro-ph/9901282
Autor:
The MACHO Collaboration, Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A., Bennett, D. P., Cook, K. H., Freeman, K. C., Griest, K., Lehner, M. J., Marshall, S. L., Minniti, D., Peterson, B. A., Pratt, M. R., Quinn, P. J., Rodgers, A. W., Rorabeck, A., Sutherland, W., Tomaney, A., Vandehei, T., Welch, D. L.
MACHO Project photometry of 45 LMC FO/SO beat Cepheids which pulsate in the first and second overtone (FO and SOo, respectively) has been analysed to determine the lightcurve characteristics for the SO mode of Cepheid pulsation. We predict that singl
Externí odkaz:
http://arxiv.org/abs/astro-ph/9808275
Autor:
The MACHO Collaboration, Alcock, C., Alves, D. R., Becker, A., Bennett, D. P., Cook, K. H., Freeman, K. C., Griest, K., Kurtz, D. W., Lehner, M. J., Marshall, S. L., Minniti, D., Peterson, B. A., Pratt, M. R., Quinn, P. J., Rodgers, A. W., Sutherland, W., Tomaney, A., Vandehei, T., Welch, D. L.
Using the novel data set of the MACHO project, we show that three ``Blazhko Effect'' RR Lyrae stars show nearly-pure amplitude modulation of a single pulsation mode. This is strong observational evidence that the ``Oblique Pulsator Model'' is the cor
Externí odkaz:
http://arxiv.org/abs/astro-ph/9808190
The EROS and MACHO collaborations have each published upper limits on the amount of planetary mass dark matter in the Galactic Halo obtained from gravitational microlensing searches. In this paper the two limits are combined to give a much stronger c
Externí odkaz:
http://arxiv.org/abs/astro-ph/9803082
Autor:
The MACHO Collaboration, Alcock, C., Allsman, R. A., Alves, D., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Freeman, K. C., Griest, K., Lehner, M. J., Marshall, S. L., Peterson, B. A., Quinn, P. J., Rodgers, A. W., Rorabeck, A., Sutherland, W., Tomaney, A., Vanderhei, T.
We report the discovery of 20 1H/2H and 7 F/1H beat Cepheids in the SMC by the MACHO Project. We utilize the 20 1H/2H stars to determine lightcurve shape for the SMC second-overtone (2H) mode of Cepheid pulsation. We predict, similar to the findings
Externí odkaz:
http://arxiv.org/abs/astro-ph/9709025
Autor:
The MACHO Collaboration, Alcock, C., Allsman, R. A., Alves, D., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Freeman, K. C., Griest, K., Keane, M. J., Lehner, M. J., Marshall, S. L., Minniti, D., Peterson, B. A., Pratt, M. R., Quinn, P. J., Rodgers, A. W., Stubbs, C. W., Sutherland, W., Tomaney, A. B., Vandehei, T., Welch, D. L.
Publikováno v:
Astrophys.J. 491 (1997) L11
We report the first discovery of a gravitational microlensing candidate towards a new population of source stars, the Small Magellanic Cloud (SMC). The candidate event's light curve shows no variation for 3 years before an upward excursion lasting $
Externí odkaz:
http://arxiv.org/abs/astro-ph/9708190
Autor:
The MACHO Collaboration, Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A., Cook, K. H., Bennett, D. P., Freeman, K. C., Griest, K., Guern, J. A., Lawson, W. A., Lehner, M. J., Marshall, S. L., Minniti, D., Peterson, B. A., Pollard, K. R., Pratt, M. R., Quinn, P. J., Rodgers, A. W., Stubbs, C. W., Sutherland, W.
We report the discovery of RV Tauri stars in the Large Magellanic Cloud. In light and colour curve behaviour, the RV Tauri stars appear to be a direct extension of the type II Cepheids to longer periods. A single period- luminosity-colour relationshi
Externí odkaz:
http://arxiv.org/abs/astro-ph/9708039