Zobrazeno 1 - 10
of 69
pro vyhledávání: '"D. Ivanov"'
Autor:
Smitha Subramanian, Marcella Marconi, Cameron P. M. Bell, S. Rubele, Joana M. Oliveira, Valentin D. Ivanov, B. L. Tatton, Samyaday Choudhury, Ning-Chen Sun, J. Th. van Loon, R. de Grijs, Kenji Bekki, Martin Groenewegen, Maria-Rosa L. Cioni, Vincenzo Ripepi
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Galaxy interactions distort the distribution of baryonic matter and can affect star formation. The nearby Magellanic Clouds are a prime example of an ongoing galaxy interaction process. Here we use the intermediate-age ($\sim1$-$10$ Gyr) red clump st
Autor:
Zephyr Penoyre, Dante Minniti, Carlos González-Fernández, N. Wyn Evans, Paweł Pietrukowicz, Jason L. Sanders, Roberto K. Saito, Leigh C. Smith, Valentin D. Ivanov, Luciano Fraga, Sergey E. Koposov, David Aguado, Andrzej Udalski, Philip W. Lucas
Publikováno v:
Smith, L C, Koposov, S E, Lucas, P W, Sanders, J L, Minniti, D, Udalski, A, Evans, N W, Aguado, D, Ivanov, V D, Saito, R K, Fraga, L, Pietrukowicz, P, Penoyre, Z & Gonzalez-Fernandez, C 2021, ' VVV-WIT-08: the giant star that blinked ', Monthly Notices of the Royal Astronomical Society, vol. 505, no. 2, pp. 1992-2008 . https://doi.org/10.1093/mnras/stab1211
We report the serendipitous discovery of a late-type giant star that exhibited a smooth, eclipse-like drop in flux to a depth of 97 per cent. Minimum flux occurred in April 2012 and the total event duration was a few hundred days. Light curves in V,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6202c843a9d1a7056763d7d610e37a02
https://www.repository.cam.ac.uk/handle/1810/323858
https://www.repository.cam.ac.uk/handle/1810/323858
Autor:
Karl M. Menten, C.-H. Rosie Chen, Rolf-Peter Kudritzki, Qingfeng Zhu, Maria Messineo, Valentin D. Ivanov, Donald F. Figer
We present infrared spectral indices (1.0-2.3 um) of Galactic late-type giants and red supergiants (RSGs). We used existing and new spectra obtained at resolution power R=2000 with SpeX on the IRTF telescope. While a large CO equivalent width (EW), a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37c753cc77671b65c91320b4f7375cb8
http://arxiv.org/abs/2107.03707
http://arxiv.org/abs/2107.03707
Autor:
Eric Pantin, Hans Ulrich Käufl, M.E. van den Ancker, N. Oberg, R. van Boekel, Ralf Siebenmorgen, Inga Kamp, M. Kissler-Patig, Davide Fedele, Ch. Rab, Valentin D. Ivanov, L. B. F. M. Waters, Paulo A. Miles-Páez, Markus Kasper, Sascha P. Quanz
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2021, 648, pp.A92. ⟨10.1051/0004-6361/202039261⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 648, pp.A92. ⟨10.1051/0004-6361/202039261⟩
Astronomy & Astrophysics, 648, 1-18
Astronomy and astrophysics, 648:A92. EDP Sciences
Astronomy & Astrophysics, 648, pp. 1-18
Astronomy and Astrophysics-A&A, 2021, 648, pp.A92. ⟨10.1051/0004-6361/202039261⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 648, pp.A92. ⟨10.1051/0004-6361/202039261⟩
Astronomy & Astrophysics, 648, 1-18
Astronomy and astrophysics, 648:A92. EDP Sciences
Astronomy & Astrophysics, 648, pp. 1-18
Mid-infrared imaging traces the sub-micron and micron sized dust grains in protoplanetary disks and it offers constraints on the geometrical properties of the disks and potential companions, particularly if those companions have circumplanetary disks
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8007d9005bf77e4491baf34f8cb37982
https://u-paris.hal.science/hal-03256075/document
https://u-paris.hal.science/hal-03256075/document
Autor:
Valentin D. Ivanov, Phil Lucas, L. D. Anderson, Zhen Guo, Robert A. Benjamin, André-Nicolas Chené, Danilo Gonzalez, Christian Moni Bidin, Sebastian Ramírez-Alegría, Leigh C. Smith, Karla Peña Ramírez, Artemio Herrero, Jura Borissova, Radostin Kurtev, W. P. Armentrout, Carlos González-Fernández, F. Mauro, Dante Minniti
We have investigated the stellar and interstellar content of the distant star formation region IRAS 17591-2228 (WISE HII region GAL 007.47+0.06). It is associated to a water maser, whose parallax distance is d=20.4^{+2.8} {-2.2} kpc, supported by ind
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91514aad430ecbd20650f4146325328a
http://arxiv.org/abs/2103.05849
http://arxiv.org/abs/2103.05849
Autor:
Leigh C. Smith, S. Points, Jura Borissova, Dante Minniti, N. Medina, C. Contreras Peña, Eduard I. Vorobyov, Valentin D. Ivanov, R. Kurtev, Philip W. Lucas, Roberto K. Saito, Zhen Guo, B. Stecklum, C. Morris, J. Elias
Publikováno v:
Mon. Not. R. Astron. Soc.
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society
We report the discovery of a mid-infrared outburst in a Young Stellar Object (YSO) with an amplitude close to 8 mag at $\lambda$$\approx$4.6 $\mu$m. WISEA J142238.82-611553.7 is one of 23 highly variable WISE sources discovered in a search of Infrare
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14954059a79889360a40ba4302d11d68
http://repositorio.unab.cl/xmlui/handle/ria/20071
http://repositorio.unab.cl/xmlui/handle/ria/20071
Autor:
T. Palma, C. Moni Bidin, Vincenzo Ripepi, Dante Minniti, P. W. Lucas, J. Fernández Trincado, Javier Alonso-García, F. Surot, Valentin D. Ivanov, S. Ramirez Alegria, Rodolfo H. Barbá, Roberto K. Saito, Daniel J. Majaess, Joyce Pullen, F. Mauro, Bruno Dias, Leigh C. Smith, M. Rejkuba, Beatriz Barbuy, A. N. Chené, Maren Hempel, Juan J. Clariá, Matías Gómez, E. R. Garro
Publikováno v:
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Context. Milky Way globular clusters (GCs) are difficult to identify at low Galactic latitudes because of high differential extinction and heavy star crowding. The new deep near-infrared (IR) images and photometry from the VISTA Variables in the Via
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80204f745a507f837945b0bd2d5bb7ee
http://arxiv.org/abs/2010.02113
http://arxiv.org/abs/2010.02113
Autor:
Valentin D. Ivanov, D. Petry
Context: WISE J085510.83-071442.5 (W0855) is a unique object: with Teff ca. 250 K, it is the coldest known brown dwarf (BD), located at only ca.2.2 pc form the Sun. It is extremely faint, which makes any astronomical observations difficult. However,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::214733a348ba7ef15477fdc8933bca2c
http://arxiv.org/abs/2009.05414
http://arxiv.org/abs/2009.05414
Autor:
Léo Girardi, A. Nanni, Martin Groenewegen, R. de Grijs, Valentin D. Ivanov, Maria-Rosa L. Cioni, M. G. Petr-Gotzens, Marcella Marconi, Vincenzo Ripepi, M. I. Moretti, J. Th. van Loon, Joana M. Oliveira
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2020, 636, ⟨10.1051/0004-6361/201937271⟩
Astronomy and Astrophysics-A&A, 2020, 636, ⟨10.1051/0004-6361/201937271⟩
(abridged)Variability is a key property of stars on the asymptotic giant branch (AGB). Their pulsation period is related to the luminosity and mass-loss rate of the star. The long-period variables (LPVs) and Mira variables are the most prominent of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::511a7b8150023f6af08c69b95cdb4334
http://arxiv.org/abs/2003.04025
http://arxiv.org/abs/2003.04025
Autor:
Ning-Chen Sun, M. I. Moretti, Joana M. Oliveira, Jim Emerson, Florian Niederhofer, Valentin D. Ivanov, Jacco Th. van Loon, Viktor Zivkov, Richard de Grijs, M. G. Petr-Gotzens, Marcella Marconi, Maria-Rosa L. Cioni, S. Rubele, Vincenzo Ripepi
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Studies of young stellar objects (YSOs) in the Galaxy have found that a significant fraction exhibit photometric variability. However, no systematic investigation has been conducted on the variability of extragalactic YSOs. Here we present the first
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91da8edc9acaed004fd73181d8578dea