Da Costa, G. S.; Rejkuba, M.; Jerjen, H.; Grebel, E. K. (2010). «Ancient Stars Beyond the Local Group: RR Lyrae Variables and Blue Horizontal Branch Stars in Sculptor Group Dwarf Galaxies». The Astrophysical Journal. 708 (2): L121. Bibcode:2010ApJ...708L.121D. arXiv:0912.1069. doi:10.1088/2041-8205/708/2/L121
Cassisi, S.; Salaris, M.; Anderson, J.; Piotto, G.; Pietrinferni, A.; Milone, A.; Bellini, A.; Bedin, L. R. (2009). «Hot Horizontal Branch Stars in ω Centauri: Clues about their Origin from the Cluster Color Magnitude Diagram». The Astrophysical Journal. 702 (2). 1530 páginas. Bibcode:2009ApJ...702.1530C. arXiv:0907.3550. doi:10.1088/0004-637X/702/2/1530
doi.org
dx.doi.org
Lee, Y. -W. (1990). «On the Sandage period shift effect among field RR Lyrae stars». The Astrophysical Journal. 363. 159 páginas. Bibcode:1990ApJ...363..159L. doi:10.1086/169326
Da Costa, G. S.; Rejkuba, M.; Jerjen, H.; Grebel, E. K. (2010). «Ancient Stars Beyond the Local Group: RR Lyrae Variables and Blue Horizontal Branch Stars in Sculptor Group Dwarf Galaxies». The Astrophysical Journal. 708 (2): L121. Bibcode:2010ApJ...708L.121D. arXiv:0912.1069. doi:10.1088/2041-8205/708/2/L121
Cassisi, S.; Salaris, M.; Anderson, J.; Piotto, G.; Pietrinferni, A.; Milone, A.; Bellini, A.; Bedin, L. R. (2009). «Hot Horizontal Branch Stars in ω Centauri: Clues about their Origin from the Cluster Color Magnitude Diagram». The Astrophysical Journal. 702 (2). 1530 páginas. Bibcode:2009ApJ...702.1530C. arXiv:0907.3550. doi:10.1088/0004-637X/702/2/1530
Adams, F. C.; Bodenheimer, P.; Laughlin, G. (2005). «M dwarfs: Planet formation and long term evolution». Astronomische Nachrichten. 326 (10). 913 páginas. Bibcode:2005AN....326..913A. doi:10.1002/asna.200510440
harvard.edu
ui.adsabs.harvard.edu
Lee, Y. -W. (1990). «On the Sandage period shift effect among field RR Lyrae stars». The Astrophysical Journal. 363. 159 páginas. Bibcode:1990ApJ...363..159L. doi:10.1086/169326
Da Costa, G. S.; Rejkuba, M.; Jerjen, H.; Grebel, E. K. (2010). «Ancient Stars Beyond the Local Group: RR Lyrae Variables and Blue Horizontal Branch Stars in Sculptor Group Dwarf Galaxies». The Astrophysical Journal. 708 (2): L121. Bibcode:2010ApJ...708L.121D. arXiv:0912.1069. doi:10.1088/2041-8205/708/2/L121
Cassisi, S.; Salaris, M.; Anderson, J.; Piotto, G.; Pietrinferni, A.; Milone, A.; Bellini, A.; Bedin, L. R. (2009). «Hot Horizontal Branch Stars in ω Centauri: Clues about their Origin from the Cluster Color Magnitude Diagram». The Astrophysical Journal. 702 (2). 1530 páginas. Bibcode:2009ApJ...702.1530C. arXiv:0907.3550. doi:10.1088/0004-637X/702/2/1530
Adams, F. C.; Bodenheimer, P.; Laughlin, G. (2005). «M dwarfs: Planet formation and long term evolution». Astronomische Nachrichten. 326 (10). 913 páginas. Bibcode:2005AN....326..913A. doi:10.1002/asna.200510440