Zobrazeno 1 - 10
of 380
pro vyhledávání: '"Graczyk, D."'
Autor:
Narloch, W., Hajdu, G., Pietrzynski, G., Gieren, W., Zgirski, B., Wielgorski, P., Karczmarek, P., Gorski, M., Graczyk, D.
RR Lyrae stars are excellent tracers of the old population II due to their period-luminosity (PL) and period-luminosity-metallicity (PLZ) relations. While these relations have been investigated in detail in many photometric bands, there are few compr
Externí odkaz:
http://arxiv.org/abs/2406.12408
Autor:
Taormina, Mónica, Kudritzki, R. -P., Pilecki, B., Pietrzyński, G., Thompson, I. B., Puls, J., Górski, M., Zgirski, B., Graczyk, D., Gieren, W., Hajdu, G.
We present the results from a complex study of an eclipsing O-type binary (Aa+Ab) with the orbital period $P_{A}=3.2254367$ days, that forms part of a higher-order multiple system in a configuration (A+B)+C. We derived masses of the Aa+Ab binary $M_{
Externí odkaz:
http://arxiv.org/abs/2404.02970
Autor:
Nardetto, N., Hocdé, V., Kervella, P., Gallenne, A., Gieren, W., Graczyk, D., Merand, A., Rainer, M., Storm, J., Pietrzynski, G., Pilecki, B., Poretti, E., Bailleul, M., Afanasiev, G. Bras A.
An inner companion has recently been discovered orbiting the prototype of classical Cepheids, delta Cep, whose orbital parameters are still not fully constrained. We collected new precise radial velocity measurements of delta Cep in 2019 using the HA
Externí odkaz:
http://arxiv.org/abs/2404.01851
Autor:
Gallenne, A., Mérand, A., Kervella, P., Graczyk, D., Pietrzyński, G., Gieren, W., Pilecki, B.
Publikováno v:
A&A 672, A119 (2023)
We aim to measure very precise and accurate model-independent masses and distances of detached binary stars. Precise masses at the $< 1$% level are necessary to test and calibrate stellar interior and evolution models, while precise and independent o
Externí odkaz:
http://arxiv.org/abs/2302.12960
Autor:
Nardetto, N., Gieren, W., Storm, J., Hocde, V., Pietrzynski, G., Kervella, P., Merand, A., Gallenne, A., Graczyk, D., Pilecki, B., Poretti, E., Rainer, M., Zgirski, B., Wielgorski, P., Hajdu, G., Gorski, M., Karczmarek, P., Narloch, W., Taormina, M.
Publikováno v:
A&A 671, A14 (2023)
The Baade-Wesselink (BW) method of distance determination of Cepheids is used to calibrate the distance scale. Various versions of this method are mainly based on interferometry and/or the surface-brightness color relation (SBCR). We quantify the imp
Externí odkaz:
http://arxiv.org/abs/2301.09468
Autor:
Suchomska, K., Graczyk, D., Gałan, C., Ziółkowska, O., Smolec, R., Pietrzyński, G., Gieren, W., Villanova, S., Górski, M., Thompson, I. B., Wielgórski, P., Zgirski, B., Karczmarek, P., Pilecki, B., Taormina, M., Narloch, W., Hajdu, G., Lewis, M., Kałuszyński, M., García, G. Rojas
Publikováno v:
A&A 668, A30 (2022)
Our goal is to determine, with high accuracy, the physical and orbital parameters of two double-lined eclipsing binary systems, where the components are two giant stars. We also aim to study the evolutionary status of the binaries, to derive the dist
Externí odkaz:
http://arxiv.org/abs/2210.12413
CPD-54 810 is a double-lined detached eclipsing binary containing two mid-F type dwarfs on an eccentric 26-day orbit. We perform a combined analysis of the extensive photometry obtained by the TESS space mission along with previously published observ
Externí odkaz:
http://arxiv.org/abs/2210.06325
Autor:
Graczyk, D., Pietrzyński, G., Galan, C., Southworth, J., Gieren, W., Kałuszyński, M., Zgirski, B., Gallenne, A., Górski, M., Hajdu, G., Karczmarek, P., Kervella, P., Maxted, P. F. L., Nardetto, N., Narloch, W., Pilecki, B., Pych, W., Garcia, G. Rojas, Storm, J., Suchomska, K., Taormina, M., Wielgórski, P.
Publikováno v:
A&A 666, A128 (2022)
Surface brightness -- colour relations (SBCRs) are very useful tools for predicting the angular diameters of stars. They offer the possibility to calculate very precise spectrophotometric distances by the eclipsing binary method or the Baade-Wesselin
Externí odkaz:
http://arxiv.org/abs/2208.07257
Autor:
Narloch, W., Pietrzyński, G., Gieren, W., Piatti, A. E., Karczmarek, P., Górski, M., Graczyk, D., Smolec, R., Hajdu, G., Suchomska, K., Zgirski, B., Wielgórski, P., Pilecki, B., Taormina, M., Kałuszyński, M., Pych, W., García, G. Rojas, Lewis, M. O.
Publikováno v:
A&A 666, A80 (2022)
We study 147 star clusters in the Large Magellanic Cloud (LMC) in order to determine their mean metallicities and ages, as well as the mean metallicities of 80 surrounding fields. We construct an age-metallicity relation (AMR) for the clusters in the
Externí odkaz:
http://arxiv.org/abs/2207.13153
Autor:
Graczyk, D., Pietrzyński, G., Gałan, C., Gieren, W., Tkachenko, A., Anderson, R. I., Gallenne, A., Górski, M., Hajdu, G., Kałuszyński, M., Karczmarek, P., Kervella, P., Maxted, P. F. L., Nardetto, N., Narloch, W., Pavlovski, K., Pilecki, B., Pych, W., Southworth, J., Storm, J., Suchomska, K., Taormina, M., Villanova, S., Wielgórski, P., Zgirski, B., Konorski, P.
Publikováno v:
A&A 649, A109 (2021)
The surface brightness -- colour relation (SBCR) is a basic tool in establishing precise and accurate distances within the Local Group. Detached eclipsing binary stars with accurately determined radii and trigonometric parallaxes allow for a calibrat
Externí odkaz:
http://arxiv.org/abs/2103.02077