Zobrazeno 1 - 10
of 1 727
pro vyhledávání: '"Red giant branch"'
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 2, p L50 (2024)
Determining the evolutionary stage of stars is crucial for understanding the evolution of exoplanetary systems. In this context, red giant branch (RGB) and red clump (RC) stars, which formed at stages in the later evolution of stars situated before a
Externí odkaz:
https://doaj.org/article/1d5f49639c144bc39f37f9476dcf2412
Autor:
Samuel K. Grunblatt, Nicholas Saunders, Daniel Huber, Daniel Thorngren, Shreyas Vissapragada, Stephanie Yoshida, Kevin C. Schlaufman, Steven Giacalone, Mason Macdougall, Ashley Chontos, Emma Turtelboom, Corey Beard, Joseph M. Akana Murphy, Malena Rice, Howard Isaacson, Ruth Angus, Andrew W. Howard
Publikováno v:
The Astronomical Journal, Vol 168, Iss 1, p 1 (2024)
Hot Neptunes, gaseous planets smaller than Saturn (∼3–8 R _⊕ ) with orbital periods less than 10 days, are rare. Models predict this is due to high-energy stellar irradiation stripping planetary atmospheres over time, often leaving behind only
Externí odkaz:
https://doaj.org/article/60a3ed11600f46b49d2be5cb04e96478
Autor:
Hai-Feng Wang, Giovanni Carraro, Xin Li, Qi-Da Li, Lorenzo Spina, Li Chen, Guan-Yu Wang, Li-Cai Deng
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 1, p 37 (2024)
In this study, we estimate the stellar ages of LAMOST DR8 red giant branch (RGB) stars based on the gradient boosting decision tree (GBDT) algorithm. We used 2643 RGB stars extracted from the APOKASC-2 asteroseismological catalog as the training data
Externí odkaz:
https://doaj.org/article/097ae946a9604b248babf4bb589c8d2e
Autor:
Barry F. Madore, Wendy L. Freedman
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 2, p 166 (2024)
Using an updated and significantly augmented sample of Cepheid and tip of the red giant branch (TRGB) distances to 28 nearby spiral and irregular galaxies, covering a wide range of metallicities, we have searched for evidence of a correlation of the
Externí odkaz:
https://doaj.org/article/00d3b2a58c6c4778a971cfd8417a1f93
Autor:
Siddharth Dhanpal, Othman Benomar, Shravan Hanasoge, Masao Takata, Subrata Kumar Panda, Abhisek Kundu
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 1, p 63 (2023)
Asteroseismology is a powerful tool that may be applied to shed light on stellar interiors and stellar evolution. Mixed modes, behaving like acoustic waves in the envelope and buoyancy modes in the core, are remarkable because they allow for probing
Externí odkaz:
https://doaj.org/article/3271ab39943f43fc9378321e0c3b49e8
Publikováno v:
The Astronomical Journal, Vol 166, Iss 6, p 224 (2023)
Given the recent successful launch of the James Webb Space Telescope, determining robust calibrations of the slopes and absolute magnitudes of the near- to mid-infrared tip of the red-giant branch (TRGB) will be essential to measuring precise extraga
Externí odkaz:
https://doaj.org/article/1d9b896ae5bb4eb9ae22585cde4ba1f2
Autor:
Justin A. Kader, Catherine A. Pilachowski, Christian I. Johnson, R. Michael Rich, Michael D. Young, Iulia T. Simion, William I. Clarkson, Scott Michael, Andrea Kunder, Anna Katherina Vivas, Andreas J. Koch-Hansen, Tommaso Marchetti
Publikováno v:
The Astrophysical Journal, Vol 950, Iss 2, p 126 (2023)
We present wide-field, high resolution maps of the color excess for 14 globular clusters toward the Southern Galactic bulge. The maps were derived using Gaia EDR3 astrometry and stellar photometry from the Blanco DECam Bulge Survey, which is a deep,
Externí odkaz:
https://doaj.org/article/0ce71fe3216b464295b70f15dc46212a
Autor:
Marcelo M. Miller Bertolami
Publikováno v:
The Astrophysical Journal, Vol 943, Iss 1, p 45 (2023)
The Red-Giant Branch Bump (RGBB) is one of the most noteworthy features in the red-giant luminosity function of stellar clusters. It is caused by the passage of the hydrogen-burning shell through the composition discontinuity left at the point of the
Externí odkaz:
https://doaj.org/article/dd8c9877be3f463790bf499c6026614b
Autor:
Ali Raza, Kashif Munir, Mubarak Almutairi, Faizan Younas, Mian Muhammad Sadiq Fareed, Gulnaz Ahmed
Publikováno v:
Applied Sciences, Vol 12, Iss 20, p 10268 (2022)
Asteroseismology studies the physical structure of stars by analyzing their solar-type oscillations as seismic waves and frequency spectra. The physical processes in stars and oscillations are similar to the Sun, which is more evolved to the red-gian
Externí odkaz:
https://doaj.org/article/10f2e9b8e339463da42a7b86f627779f
Spinning up the Surface: Evidence for Planetary Engulfment or Unexpected Angular Momentum Transport?
Autor:
Jamie Tayar, Facundo D. Moyano, Melinda Soares-Furtado, Ana Escorza, Meridith Joyce, Sarah L. Martell, Rafael A. García, Sylvain N. Breton, Stéphane Mathis, Savita Mathur, Vincent Delsanti, Sven Kiefer, Sabine Reffert, Dominic M. Bowman, Timothy Van Reeth, Shreeya Shetye, Charlotte Gehan, Samuel K. Grunblatt
Publikováno v:
The Astrophysical Journal, Vol 940, Iss 1, p 23 (2022)
In this paper, we report the potential detection of a nonmonotonic radial rotation profile in a low-mass lower-luminosity giant star. For most low- and intermediate-mass stars, the rotation on the main sequence seems to be close to rigid. As these st
Externí odkaz:
https://doaj.org/article/6001f52a1aa9479f86e2d63223f3da31