Abstract
Photometric surveys at optical, ultraviolet, and infrared wavelengths provide ever-growing datasets as major surveys proceed. Colour-colour diagrams are useful tools to identify classes of star and provide large samples. However, combining all photometric measurements of a star into a spectral energy distribution will allow quantitative analyses to be carried out. We demonstrate how to construct and exploit spectral energy distributions and colours for sublumious B (sdB) stars. The aim is to identify cool companions to hot subdwarfs and to determine atmospheric parameters of apparently single sdB stars as well as composite spectrum sdB binaries.We analyse two sdB stars with high-quality photometric data which serve as our benchmarks, the apparently single sdB HD205805 and the sdB + K5 binary PG 0749+658, briefly present preliminary results for the sample of 142 sdB binaries with known orbits, and discuss future prospects from ongoing all-sky optical space- (Gaia) and ground-based (e.g. SkyMapper) as well as NIR surveys.
References
Alam, S., Albareti, F. D., Allende Prieto, C., Anders, F., Anderson, S. F., Anderton, T. et al. 2015, ApJS, 219, 12.Search in Google Scholar
Allard, F., Wesemael, F., Fontaine, G., Bergeron, P., & Lamontagne, R. 1994, AJ, 107, 1565-1576.Search in Google Scholar
Asplund, M., Grevesse, N., Sauval, A. J., & Scott, P. 2009, ARA&A, 47, 481-522.Search in Google Scholar
Aznar Cuadrado, R. & Jeffery, C. S. 2001, A&A, 368, 994-1005.Search in Google Scholar
Aznar Cuadrado, R. & Jeffery, C. S. 2002, A&A, 385, 131-142.Search in Google Scholar
Cutri, R. M. et al. 2013, VizieR Online Data Catalog, 2328.Search in Google Scholar
Fitzpatrick, E. L. 1999, PASP, 111, 63-75.Search in Google Scholar
Geier, S. 2013, A&A, 549, A110.Search in Google Scholar
Geier, S., Kupfer, T., Heber, U., Schaffenroth, V., Barlow, B. N., Østensen, R. H., et al. 2017, A&A, 602, C2.Search in Google Scholar
Green, E. M., Fontaine, G., Hyde, E. A., For, B.-Q., & Chayer, P. 2008, In: U. Heber, C. S. Jeffery, & R. Napiwotzki (Eds.), Hot Subdwarf Stars and Related Objects (23-27 July 2007, Bamberg, Germany), ASP Conf. Ser., 392, 75-82.Search in Google Scholar
Green, R. F., Schmidt, M., & Liebert, J. 1986, ApJS, 61, 305-352.10.1086/191115Search in Google Scholar PubMed
Heber, U. 1986, A&A, 155, 33-45.10.2307/20555968Search in Google Scholar PubMed
Heber, U. 2009, ARA&A, 47, 211-251.Search in Google Scholar
Heber, U. 2016, PASP, 128, 082001.Search in Google Scholar
Heber, U., Hunger, K., Jonas, G., & Kudritzki, R. P. 1984, A&A, 130, 119-130.Search in Google Scholar
Heber, U., Moehler, S., Napiwotzki, R., Thejll, P., & Green, E. M. 2002, A&A, 383, 938-951.Search in Google Scholar
Heber, U., Reid, I. N., & Werner, K. 2000, A&A, 363, 198-207.Search in Google Scholar
Henden, A. A., Templeton, M., Terrell, D., et al. 2016, VizieR Online Data Catalog, 2336.Search in Google Scholar
Houck, J. C. & Denicola, L. A. 2000, In: N. Manset, C. Veillet, & D. Crabtree (Eds.), Astronomical Data Analysis Software and Systems IX, ASP Conf. Ser., 216, 591-594.Search in Google Scholar
Hubeny, I., Hummer, D. G., & Lanz, T. 1994, A&A, 282, 151-167.Search in Google Scholar
Husser, T.-O., Wende-von Berg, S., Dreizler, S., Homeier, D., Reiners, A., Barman, T. et al. 2013, A&A, 553, A6.Search in Google Scholar
Kawka, A., Vennes, S., O’Toole, S., Németh, P., Burton, D., Kotze, E. et al. 2015, MNRAS, 450, 3514-3548.Search in Google Scholar
Kupfer, T., Geier, S., Heber, U., Østensen, R. H., Barlow, B. N., Maxted, P. F. L. et al. 2015, A&A, 576, A44.Search in Google Scholar
Kurucz, R. L. 1996, In: S. J. Adelman, F. Kupka, & W. W. Weiss (Eds.), Model Atmospheres and Spectrum Synthesis, ASP Conf. Ser., 108, 160-164.Search in Google Scholar
Lawrence, A., Warren, S. J., Almaini, O., Edge, A. C., Hambly, N. C., Jameson, R. F.et al. 2007, MNRAS, 379, 1599-1617.Search in Google Scholar
Maxted, P. F. L., Heber, U., Marsh, T. R., & North, R. C. 2001, MNRAS, 326, 1391-1402.Search in Google Scholar
Naslim, N., Jeffery, C. S., Hibbert, A., & Behara, N. T. 2013, MNRAS, 434, 1920-1929.Search in Google Scholar
Ohl, R. G., Chayer, P., & Moos, H. W. 2000, ApJ, 538, L9510.1086/312802Search in Google Scholar
Østensen, R. H. 2006, Baltic Astronomy, 15, 85-90.Search in Google Scholar
Saffer, R. A., Bergeron, P., Koester, D., & Liebert, J. 1994, ApJ, 432, 351-366.Search in Google Scholar
Skrutskie, M. F., Cutri, R. M., Stiening, R., Weinberg, M. D., Schneider, S., Carpenter, J. M. et al. 2006, AJ, 131, 1163-1183.Search in Google Scholar
Stark, M. A. & Wade, R. A. 2003, AJ, 126, 1455-1471.Search in Google Scholar
Wright, E. L., Eisenhardt, P. R. M., Mainzer, A. K., Mainzer, A. K., Ressler, M. E., Cutri, R. M. et al. 2010, AJ, 140, 1868-1881.Search in Google Scholar PubMed
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