Stellar chronometers: the relation between age, chromospheric activity, rotation and lithium abundances in solar-type stars

• Grant number: 16/20667-8
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: April 01, 2017
• End date: August 31, 2021
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Jorge Luis Melendez Moreno
• Grantee: Diego Lorenzo de Oliveira
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 18/04055-8 - High precision spectroscopy: from the first stars to planets, AP.TEM

Abstract

Our main goal is to study the impact of stellar abundances and other atmospheric parameters on the determination of chromospheric activity levels traced by different spectroscopic indicators such as: Ca II & K, Na I dublet, Halpha, Hbeta and Ca II infrared triplet lines. This study will use chromospheric fluxes to obtain stellar ages through age-activity relations. As a result, we plan to: 1) characterize comprehensively the chromospheric activity phenomena, exploring the correlations between the chromospheric activity indicators (flux-flux relations); 2) investigate the relationship between the stellar activity level, stellar rotation and the convective mixing processes traced by lithium depletion in solar-type stars. To this end, we will derive chromospheric absolute fluxes based on modern theoretical models of stellar atmospheres Lorenzo-Oliveira et al. 2016 for a benchmark sample of 88 solar twins (Ramírez et al. 2014) with high-precision spectroscopic parameters(sigma(Teff) = 7 K, sigma([Fe/H]) = 0.01 dex and sigma(log g) = 0.02 dex). Moreover, in order to extend the relations derived for solar twins, we compiled high spectral resolution and signal-to-noise ratio spectra for a large ancillary sample of solar-type stars within a broad range of masses and metallicities. Precise atmospheric parameters (Teff, [Fe/H] and log g) will be determined for these stars in the light of detailed spectroscopic line-by-line analysis (excitation and ionisation equilibria of Fe I and Fe II lines) and evolutionary parameters will be estimated through HR diagrams. Our final goal is to provide the most reliable activity-age relations for age dating. (AU)

Scientific publications

(17)

(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)

GIRIBALDI, R. E.; UBALDO-MELO, M. L.; PORTO DE MELLO, G. F.; PASQUINI, L.; LUDWIG, H-G; ULMER-MOLL, S.; LORENZO-OLIVEIRA, D.. Accurate effective temperature from H alpha profiles. Astronomy & Astrophysics, v. 624, APR 1 2019. (16/20667-8)

GIRIBALDI, R. E.; DE MELLO, G. F. PORTO; LORENZO-OLIVEIRA, D.; AMORES, E. B.; UBALDO-MELO, M. L.. Faint solar analogues at the limit of no reddening Precise atmospheric parameters from moderate low-resolution spectra. Astronomy & Astrophysics, v. 629, SEP 2 2019. (16/20667-8)

GALARZA, JHON YANA; MELENDEZ, JORGE; LORENZO-OLIVEIRA, DIEGO; VALIO, ADRIANA; REGGIANI, HENRIQUE; CARLOS, MARILIA; PONTE, GEISA; SPINA, LORENZO; HAYWOOD, RAPHAELLE D.; GANDOLFI, DAVIDE. The effect of stellar activity on the spectroscopic stellar parameters of the young solar twin HIP 36515. Monthly Notices of the Royal Astronomical Society, v. 490, n. 1, p. L86-L90, NOV 2019. (16/20667-8, 18/04055-8)

LORENZO-OLIVEIRA, DIEGO; FREITAS, FABRICIO C.; MELENDEZ, JORGE; BEDELL, MEGAN; RAMIREZ, IVAN; BEAN, JACOB L.; ASPLUND, MARTIN; SPINA, LORENZO; DREIZLER, STEFAN; ALVES-BRITO, ALAN; et al. The Solar Twin Planet Search The age-chromospheric activity relation. Astronomy & Astrophysics, v. 619, NOV 8 2018. (12/24392-2, 16/20667-8)

BARRAGAN, O.; GANDOLFI, D.; SMITH, A. M. S.; DEEG, H. J.; FRIDLUND, M. C. V.; PERSSON, C. M.; DONATI, P.; ENDL, M.; CSIZMADIA, SZ.; GRZIWA, S.; et al. K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star. Monthly Notices of the Royal Astronomical Society, v. 475, n. 2, p. 1765-1776, APR 2018. (16/20667-8)

NETTO, YURI; LORENZO-OLIVEIRA, DIEGO; MELENDEZ, JORGE; YANA GALARZA, JHON; HAYWOOD, RAPHAELLE D.; SPINA, LORENZO; DOS SANTOS, LEONARDO A.. Radial-velocity Precision of ESPRESSO Through the Analysis of the Solar Twin HIP 11915. ASTRONOMICAL JOURNAL, v. 162, n. 4, OCT 2021. (18/04055-8, 19/20319-8, 16/20667-8)

TUCCI MAIA, M.; MELENDEZ, J.; LORENZO-OLIVEIRA, D.; SPINA, L.; JOFRE, P.. Revisiting the 16 Cygni planet host at unprecedented precision and exploring automated tools for precise abundances. ASTRONOMY & ASTROPHYSICS, v. 628, p. 11-pg., 2019-08-20. (18/04055-8, 16/20667-8, 14/15706-9)

TUCCI MAIA, M.; MELENDEZ, J.; LORENZO-OLIVEIRA, D.; SPINA, L.; JOFRE, P.. Revisiting the 16 Cygni planet host at unprecedented precision and exploring automated tools for precise abundances. Astronomy & Astrophysics, v. 628, AUG 20 2019. (16/20667-8, 14/15706-9, 18/04055-8)

GRIEVES, N.; GE, J.; THOMAS, N.; WILLIS, K.; MA, B.; LORENZO-OLIVEIRA, D.; QUEIROZ, A. B. A.; GHEZZI, L.; CHIAPPINI, C.; ANDERS, F.; et al. Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey. Monthly Notices of the Royal Astronomical Society, v. 481, n. 3, p. 3244-3265, DEC 2018. (16/20667-8)

LORENZO-OLIVEIRA, DIEGO; MELENDEZ, JORGE; GALARZA, JHON YANA; PONTE, GEISA; DOS SANTOS, LEONARDO A.; SPINA, LORENZO; BEDELL, MEGAN; RAMIREZ, IVAN; BEAN, JACOB L.; ASPLUND, MARTIN. Constraining the evolution of stellar rotation using solar twins. Monthly Notices of the Royal Astronomical Society, v. 485, n. 1, p. L68-L72, MAY 2019. (18/04055-8, 16/20667-8)

COSTA-ALMEIDA, ELLEN; PORTO DE MELLO, GUSTAVO F.; GIRIBALDI, RIANO E.; LORENZO-OLIVEIRA, DIEGO; UBALDO-MELO, MARIA L.. dwarf spectral indices at moderate resolution: accurate T-eff and [Fe/H] for 178 southern star. Monthly Notices of the Royal Astronomical Society, v. 508, n. 4, p. 5148-5162, DEC 2021. (16/20667-8)

GALARZA, JHON YANA; LOPEZ-VALDIVIA, RICARDO; MELENDEZ, JORGE; LORENZO-OLIVEIRA, DIEGO. Evidence of Rocky Planet Engulfment in the Wide Binary System HIP 71726/HIP 71737. ASTROPHYSICAL JOURNAL, v. 922, n. 2, DEC 2021. (16/20667-8, 18/04055-8)

GALARZA, JHON YANA; MELENDEZ, JORGE; KARAKAS, I, AMANDA; ASPLUND, MARTIN; LORENZO-OLIVEIRA, DIEGO. Explosive nucleosynthesis of a metal-deficient star as the source of a distinct odd-even effect in the solar twin HIP 11915. Monthly Notices of the Royal Astronomical Society, v. 502, n. 1, p. L104-L109, MAR 2021. (16/20667-8)

GALARZA, JHON YANA; LOPEZ-VALDIVIA, RICARDO; LORENZO-OLIVEIRA, DIEGO; REGGIANI, HENRIQUE; MELENDEZ, JORGE; GAMARRA-SANCHEZ, DANIEL; FLORES, MATIAS; PORTAL-RIVERA, JERRY; MIQUELARENA, PAULA; PONTE, GEISA; et al. Searching for new solar twins: The Inti survey for the Northern Sky. Monthly Notices of the Royal Astronomical Society, v. 504, n. 2, p. 1873-1887, JUN 2021. (16/20667-8, 18/04055-8)

LORENZO-OLIVEIRA, DIEGO; MELENDEZ, JORGE; PONTE, GEISA; GALARZA, JHON YANA. The ancient main-sequence solar proxy HIP 102152 unveils the activity and rotational fate of our Sun. Monthly Notices of the Royal Astronomical Society, v. 495, n. 1, p. L61-L65, JUN 2020. (16/20667-8, 18/04055-8)

GIRIBALDI, R. E.; UBALDO-MELO, M. L.; PORTO DE MELLO, G. F.; PASQUINI, L.; LUDWIG, H-G; ULMER-MOLL, S.; LORENZO-OLIVEIRA, D.. Accurate effective temperature from H alpha profiles. ASTRONOMY & ASTROPHYSICS, v. 624, p. 22-pg., 2019-04-01. (16/20667-8)

PONTE, GEISA; LORENZO-OLIVEIRA, DIEGO; MELENDEZ, JORGE; YANA GALARZA, JHON; VALIO, ADRIANA. Photometric variations from stellar activity as an age indicator for solar-twins. Monthly Notices of the Royal Astronomical Society, v. 522, n. 2, p. 8-pg., 2023-04-21. (18/04055-8, 16/20667-8)