Results 21 to 30 of about 40,509 (299)

Kinematics of OB-associations and the new reduction of the Hipparcos data [PDF]

, 2009
The proper motions of OB-associations computed using the old (Hipparcos 1997} and new (van Leeuwen 2007) reductions of the Hipparcos data are in a good agreement with each other.
A. K. Dambis, A. M. Mel'nik, Barbier-Brossat, Berdnikov, Blaha, Dambis, Dambis, de Zeeuw, Efremov, Garmany, Hawley, Humphreys, Kovalevsky, Mel'nik, Mel'nik, Mel'nik, Press, Rastorguev, Reid, Sitnik, van Leeuwen, Zabolotskikh   +21 more
core   +1 more source

Lithium depletion boundary, stellar associations, andGaia

Astronomy & Astrophysics, 2022
Context.Stellar ages are key to improving our understanding of different astrophysical phenomena. However, many techniques to estimate stellar ages are highly model-dependent. The lithium depletion boundary (LDB), based on the presence or absence of lithium in low-mass stars, can be used to derive ages in stellar associations of between 20 and 500 Ma ...
F. J. Galindo-Guil, D. Barrado, H. Bouy, J. Olivares, A. Bayo, M. Morales-Calderón, N. Huélamo, L. M. Sarro, P. Rivière-Marichalar, H. Stoev, B. Montesinos, J. R. Stauffer   +11 more
openaire   +3 more sources

On the Spatial Distribution of Stellar Populations in the Large Magellanic Cloud [PDF]

, 1999
We measure the angular correlation function of stars in a region of the Large Magellanic Cloud (LMC) that spans 2 degrees by 1.5 degrees. We find that the correlation functions of stellar populations are represented well by exponential functions of the ...
Caldwell J. A. R., Dennis Zaritsky, Dohm-Palmer R.C., Fagotto F., Feitzenger J. V., Jason Harris, Kontizas M., Larson R. B., McKibben Nail V., Tenorio-Tagle G.   +9 more
core   +3 more sources

Six More Ultra-faint Milky Way Companions Discovered in the DECam Local Volume Exploration Survey

The Astrophysical Journal, 2023
We report the discovery of six ultra-faint Milky Way satellites identified through matched-filter searches conducted using Dark Energy Camera (DECam) data processed as part of the second data release of the DECam Local Volume Exploration (DELVE) survey ...
W. Cerny, C. E. Martínez-Vázquez, A. Drlica-Wagner, A. B. Pace, B. Mutlu-Pakdil, T. S. Li, A. H. Riley, D. Crnojević, C. R. Bom, J. A. Carballo-Bello, J. L. Carlin, A. Chiti, Y. Choi, M. L. M. Collins, E Darragh-Ford, P. S. Ferguson, M. Geha, D. Martínez-Delgado, P. Massana, S. Mau, G. E. Medina, R. R. Muñoz, E. O. Nadler, N. E. D. Noël, K. A. G. Olsen, A. Pieres, J. D. Sakowska, J. D. Simon, G. S. Stringfellow, E. J. Tollerud, A. K. Vivas, A. R. Walker, R. H. Wechsler, DELVE Collaboration   +33 more
doaj   +1 more source

PHANGS–JWST First Results: Multiwavelength View of Feedback-driven Bubbles (the Phantom Voids) across NGC 628

The Astrophysical Journal Letters, 2023
We present a high-resolution view of bubbles within the Phantom Galaxy (NGC 628), a nearby (∼10 Mpc), star-forming (∼2 M _⊙ yr ^−1 ), face-on ( i ∼ 9°) grand-design spiral galaxy.
Ashley. T. Barnes, Elizabeth J. Watkins, Sharon E. Meidt, Kathryn Kreckel, Mattia C. Sormani, Robin G. Treß, Simon C. O. Glover, Frank Bigiel, Rupali Chandar, Eric Emsellem, Janice C. Lee, Adam K. Leroy, Karin M. Sandstrom, Eva Schinnerer, Erik Rosolowsky, Francesco Belfiore, Guillermo A. Blanc, Médéric Boquien, Jakob den Brok, Yixian Cao, Mélanie Chevance, Daniel A. Dale, Oleg V. Egorov, Cosima Eibensteiner, Kathryn Grasha, Brent Groves, Hamid Hassani, Jonathan D. Henshaw, Sarah Jeffreson, María J. Jiménez-Donaire, Benjamin W. Keller, Ralf S. Klessen, Eric W. Koch, J. M. Diederik Kruijssen, Kirsten L. Larson, Jing Li, Daizhong Liu, Laura A. Lopez, Eric J. Murphy, Lukas Neumann, Jérôme Pety, Francesca Pinna, Miguel Querejeta, Florent Renaud, Toshiki Saito, Sumit K. Sarbadhicary, Amy Sardone, Rowan J. Smith, Sophia K. Stuber, Jiayi Sun, David A. Thilker, Antonio Usero, Bradley C. Whitmore, Thomas G. Williams   +53 more
doaj   +1 more source

Lower limit for differential rotation in members of young loose stellar associations [PDF]

, 2016
Surface differential rotation (SDR) plays a key role in dynamo models. SDR estimates are therefore essential for constraining theoretical models. We measure a lower limit to SDR in a sample of solar-like stars belonging to young associations with the aim
Distefano, E., Lanza, A. F., Lanzafame, A. C., Messina, S., Spada, F.   +4 more
core   +2 more sources

A Census of the Stellar Populations in the Sco-Cen Complex

The Astronomical Journal, 2021
I have used high-precision photometry and astrometry from the early installment of the third data release of Gaia (EDR3) to perform a survey for members of the stellar populations within the Sco-Cen complex, which consist of Upper Sco, UCL/LCC, the V1062
K. L. Luhman
doaj   +1 more source

STELLAR WIND IN THE ISM

Odessa Astronomical Publications, 2017
After a brief review of the modern understanding of stellar wind's action on the ISM we consider two aspects of its "global" collective effect from observational viewpoint.
T. A. Lozinskaya
doaj   +1 more source

Isolated OB Associations in Stripped HI Gas Clouds

, 2008
HST ACS/HRC images in UV (F250W), V (F555W), and I (F814W) resolve three isolated OB associations that lie up to 30 kpc from the stellar disk of the S0 galaxy NGC 1533.
Chiosi C., Duc P.-A., Duc P.-A., E. V. Ryan‐Weber, G. R. Meurer, Goodwin S. P., Ivanov G. R., J. K. Werk, K. C. Freeman, M. E. Putman, M. S. Oey, Meynet G., R. C. Kennicutt, Jr.   +12 more
core   +1 more source

Probing embedded star clusters in the HII complex NGC 6357 with VVV [PDF]

, 2014
NGC 6357 is an active star-forming region located in the Sagittarius arm displaying several star clusters, which makes it a very interesting target to investigate star formation and early cluster evolution.
Bica, E., Bonatto, C., Lima, E. F., Saito, R. K.   +3 more
core   +3 more sources