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Accurate distances to young clusters through massive eclipsing binaries

Grant number: 12/09716-6
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): February 01, 2013
Effective date (End): August 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal researcher:Augusto Damineli Neto
Grantee:Leonardo Andrade de Almeida
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope, AP.ESP
Associated scholarship(s):13/18245-0 - Full spectroscopic orbital solutions for more than 100 massive binaries in the high-mass starburst region 30 Doradus, BE.EP.PD


Confidence in the models of stellar structure and evolution of massive stars depends on the accuracy with which their basic parameters can be measured. The key step consists in determining accurate distances. This parameter is also fundamental for the census of stellar populations in clusters and galaxies. In this context, massive stars are relevant, given their high luminosities. Several new open clusters, some with large mass, have been discovered in the Milky Way, most of them so far and so affected by reddening that traditional methods of measurement of distances can not be applied. For these cases, the most direct and most accurate way of determining distances is based on the study of eclipsing binary systems (Torres et al. 1991, Vaz et al. 1997 e Torres et al. 2010). Besides the distances, it is possible to determine all the system parameters (Massey et al. 2012). The study of OB type stars has allowed the direct measurement of distances to galaxies like Andromeda (Bonanos 2010). Nearby galaxies have been mapped in order to determine the spatial distribution of their stellar populations. In particular, it is possible to evaluate the thickness of the Large Magellanic Cloud. New deep surveys, such as the one being done with the VISTA telescope in the infrared (, covering the galactic plane, and the LSST telescope ( in the optical (from 2016), which will cover the whole sky of the Southern Hemisphere, will open wide horizons in this field, through the discovery of hundreds of massive eclipsing binaries.This project was designed to study a particular eclipsing binary in Westerlund 1 (Wdeb) as an example, in order to test our procedures. This is driven by the fact that we have already more than 70 nights of photometry for Westerlund 1 in the OPD Observatory, 4 epochs of spectroscopy in Gemini telescope and 5 nights in Soar. The procedures tested in this case will be used to the similar objects expected to be discovered in the near future in other stellar clusters.

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Scientific publications (15)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ALMEIDA, L. A.; DAMINELI, A.; RODRIGUES, C. V.; PEREIRA, M. G.; JABLONSKI, F.. HS 2231+2441: an HW Vir system composed of a low-mass white dwarf and a brown dwarf. Monthly Notices of the Royal Astronomical Society, v. 472, n. 3, p. 3093-3100, . (13/26258-4, 13/18245-0, 12/09716-6, 11/51680-6)
OLIVEIRA, A. S.; RODRIGUES, C. V.; CIESLINSKI, D.; JABLONSKI, F. J.; SILVA, K. M. G.; ALMEIDA, L. A.; RODRIGUEZ-ARDILA, A.; PALHARES, M. S.. Exploratory Spectroscopy of Magnetic Cataclysmic Variables Candidates and Other Variable Objects. ASTRONOMICAL JOURNAL, v. 153, n. 4, . (13/26258-4, 13/18245-0, 12/09716-6)
DAMINELI, A.; ALMEIDA, L. A.; BLUM, R. D.; DAMINELI, D. S. C.; NAVARETE, F.; RUBINHO, M. S.; TEODORO, M.. Extinction law in the range 0.4-4.8 mu m and the 8620 angstrom DIB towards the stellar cluster Westerlund 1. Monthly Notices of the Royal Astronomical Society, v. 463, n. 3, p. 2653-2666, . (13/18245-0, 12/09716-6, 11/51680-6, 13/11680-2)
SHENAR, T.; RICHARDSON, N. D.; SABLOWSKI, D. P.; HAINICH, R.; SANA, H.; MOFFAT, A. F. J.; TODT, H.; HAMANN, W. -R.; OSKINOVA, L. M.; SANDER, A.; et al. The Tarantula Massive Binary Monitoring II. First SB2 orbital and spectroscopic analysis for the Wolf-Rayet binary R145. Astronomy & Astrophysics, v. 598, . (13/18245-0, 12/09716-6)
ALMEIDA, L. A.; DE ALMEIDA, L.; DAMINELI, A.; RODRIGUES, V, C.; CASTRO, M.; LOPES, C. E. FERREIRA; JABLONSKI, F.; DO NASCIMENTO JR, J-D; PEREIRA, M. G.. Orbital Period Variation of KIC 10544976: Applegate Mechanism versus Light Travel Time Effect. ASTRONOMICAL JOURNAL, v. 157, n. 4, . (12/09716-6, 13/26258-4, 13/18245-0, 11/51680-6)
DAMINELI, A.; FERNANDEZ-LAJUS, E.; ALMEIDA, L. A.; CORCORAN, M. F.; DAMINELI, D. S. C.; GULL, T. R.; HAMAGUCHI, K.; HILLIER, D. J.; JABLONSKI, F. J.; MADURA, T. I.; et al. Distinguishing circumstellar from stellar photometric variability in Eta Carinae. Monthly Notices of the Royal Astronomical Society, v. 484, n. 1, p. 1325-1346, . (12/09716-6, 17/18191-8, 13/18245-0, 11/51680-6)
MAHY, L.; SANA, H.; ABDUL-MASIH, M.; ALMEIDA, L. A.; LANGER, N.; SHENAR, T.; DE KOTER, A.; DE MINK, S. E.; DE WIT, S.; GRIN, N. J.; et al. The Tarantula Massive Binary Monitoring III. Atmosphere analysis of double-lined spectroscopic systemsx22c6;. Astronomy & Astrophysics, v. 634, . (13/18245-0, 12/09716-6, 11/51680-6)
MAHY, L.; ALMEIDA, L. A.; SANA, H.; CLARK, J. S.; DE KOTER, A.; DE MINK, S. E.; EVANS, C. J.; GRIN, N. J.; LANGER, N.; MOFFAT, A. F. J.; et al. The Tarantula Massive Binary Monitoring IV. Double-lined photometric binaries. Astronomy & Astrophysics, v. 634, . (13/18245-0, 12/09716-6, 11/51680-6)
HOWARTH, I. D.; DUFTON, P. L.; DUNSTALL, P. R.; EVANS, C. J.; ALMEIDA, L. A.; BONANOS, A. Z.; CLARK, J. S.; LANGER, N.; SANA, H.; SIMON-DIAZ, S.; et al. The VLT-FLAMES Tarantula Survey XXIII. Two massive double-lined binaries in 30 Doradus. Astronomy & Astrophysics, v. 582, . (13/18245-0, 12/09716-6)
MOLINO, A.; COSTA-DUARTE, V, M.; SAMPEDRO, L.; HERPICH, F. R.; SODRE JR, L.; MENDES DE OLIVEIRA, C.; SCHOENELL, W.; BARBOSA, C. E.; QUEIROZ, C.; LIMA, E. V. R.; et al. Assessing the photometric redshift precision of the S-PLUS survey: the Stripe-82 as a test-case. Monthly Notices of the Royal Astronomical Society, v. 499, n. 3, p. 3884-3908, . (14/18632-6, 16/21664-2, 13/18245-0, 17/50277-0, 11/51680-6, 09/54202-8, 16/17119-9, 19/11910-4, 12/09716-6, 14/07684-5)
ABDUL-MASIH, MICHAEL; SANA, HUGUES; SUNDQVIST, JON; MAHY, LAURENT; MENON, ATHIRA; ALMEIDA, LEONARDO A.; DE KOTER, ALEX; DE MINK, SELMA E.; JUSTHAM, STEPHEN; LANGER, NORBERT; et al. Clues on the Origin and Evolution of Massive Contact Binaries: Atmosphere Analysis of VFTS 352. ASTROPHYSICAL JOURNAL, v. 880, n. 2, . (12/09716-6, 11/51680-6, 13/18245-0)
ALMEIDA, L. A.; SANA, H.; TAYLOR, W.; BARBA, R.; BONANOS, A. Z.; CROWTHER, P.; DAMINELI, A.; DE KOTER, A.; DE MINK, S. E.; EVANS, C. J.; et al. The Tarantula Massive Binary Monitoring I. Observational campaign and OB-type spectroscopic binaries. Astronomy & Astrophysics, v. 598, . (13/18245-0, 12/09716-6)
MOYANO, M.; ALMEIDA, L. A.; VON ESSEN, C.; JABLONSKI, F.; PEREIRA, M. G.. Multi-band characterization of the hot Jupiters: WASP-5b, WASP-44b and WASP-46b. Monthly Notices of the Royal Astronomical Society, v. 471, n. 1, p. 650-657, . (13/18245-0, 12/09716-6)
SILVA, K. M. G.; RODRIGUES, C. V.; OLIVEIRA, A. S.; ALMEIDA, L. A.; CIESLINSKI, D.; COSTA, J. E. R.; JABLONSKI, F. J.. MLS110213:022733+130617: a new eclipsing polar above the period gap. Monthly Notices of the Royal Astronomical Society, v. 451, n. 4, p. 4183-4192, . (13/26258-4, 13/18245-0, 12/09716-6)

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