J/ApJ/940/12 HeI{lambda}10830 in red giant stars with HET/HPF (Sneden+, 2022) ================================================================================ The active chromospheres of lithium-rich red giant stars. Sneden C., Afsar M., Bozkurt Z., Adamow M., Mallick A., Reddy B.E., Janowiecki S., Mahadevan S., Bowler B.P., Hawkins K., Lind K., Dupree A.K., Ninan J.P., Nagarajan N., Topcu G.B., Froning C.S., Bender C.F., Terrien R., Ramsey L.W., Mace G.N. =2022ApJ...940...12S ================================================================================ ADC_Keywords: Spectra, infrared; Stars, giant; Equivalent widths; Abundances Keywords: Stellar spectral lines ; Stellar chromospheres ; Stellar photospheres ; Stellar abundances ; Red giant stars Abstract: We have gathered near-infrared zyJ-band high-resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their HeI{lambda}10830 absorption strengths. This transition is an indicator of chromospheric activity and/or mass loss in red giants. The majority of stars in our sample reside in the red clump or red horizontal branch based on their V-J, M_V_ color-magnitude diagram, and Gaia Teff and log(g) values. Most of our target stars are Li-poor in the sense of having normally low Li abundances, defined here as log {epsilon}(Li)<1.25. Over 90% of these Li-poor stars have weak {lambda}10830 features. However, more than half of the 83 Li-rich stars (log{epsilon}(Li)>1.25) have strong {lambda}10830 absorptions. These large {lambda}10830 lines signal excess chromospheric activity in Li-rich stars; there is almost no indication of significant mass loss. The Li-rich giants may also have a higher binary fraction than Li-poor stars, based on their astrometric data. It appears likely that both residence on the horizontal branch and present or past binary interaction play roles in the significant Li-He connection established in this survey. Description: We gathered the Hobby-Eberly Telescope (HET)/Habitable-zone Planet Finder (HPF) high-resolution zyJ (8100-12750{AA}) spectra of the program stars for about a year beginning in 2021 April. HPF was configured for our program to deliver a spectral resolving power of R={lambda}/{Delta}{lambda}~55000. There are 278 program stars entered in Table 1. Of this total, 76 stars are Li-rich according to the tentative definition discussed in Section 2, 187 stars are Li-poor, and 15 stars have no Li abundance. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 78 278 Program star data -------------------------------------------------------------------------------- See also: I/259 : The Tycho-2 Catalogue (Hog+ 2000) J/A+A/395/97 : RV and vsini of Ib supergiant stars (de Medeiros+, 2002) J/A+A/492/277 : Analysis of Collinder 69 stars with VOSA (Bayo+, 2008) J/AJ/135/209 : Rot. & radial velocities 761 HIP giants (Massarotti+, 2008) J/A+A/504/829 : Sp. survey of youngest field stars (Guillout+, 2009) J/AJ/140/1911 : Astrometric Grid Giant Star Survey. III. (Bizyaev+, 2010) J/ApJ/757/109 : Rot. velocities + Li abundance in K giants (Carlberg+, 2012) J/A+A/547/A91 : Spectroscopic analysis of 348 red giants (Zielinski+, 2012) J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013) J/A+A/569/A55 : Abundances and vsini for 348 red giants (Adamow+, 2014) J/AJ/149/15 : Spectroscopy of NGC 7789 (Overbeek+, 2015) J/AJ/150/123 : Catalog of 316 K giant candidates (Rebull+, 2015) J/A+A/605/A111 : Surface rotation of Kepler red giant stars (Ceillier+, 2017) J/A+A/613/A47 : Radial velocities of 12 evolved stars (Adamow+, 2018) J/AJ/155/240 : A spectroscopic survey of field RHB stars (Afsar+, 2018) J/ApJ/865/44 : Abundances of evolved stars from IGRINS. I. (Afsar+, 2018) J/A+A/615/A31 : PTPS stars IV. (Deka-Szymankiewicz+, 2018) J/AJ/156/142 : Cluster abund. for APOGEE using SDSS DR14 (Donor+, 2018) J/A+A/623/A80 : Open clusters in APOGEE and GALAH surveys (Carrera+, 2019) J/MNRAS/490/1821 : Abundances for stars in open clusters (Casamiquela+, 2019) J/MNRAS/484/2000 : Study of Lithium-rich giants with GALAH (Deepak+, 2019) J/A+A/633/A34 : Lithium in red giant stars (Charbonnel+, 2020) J/A+A/634/A1 : NGC 1068 GRAVITY reconstructed image (GRAVITY+, 2020) J/A+A/639/A7 : Li-rich and non-Li-rich K giants RVs (Jorissen+, 2020) J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Cat. of Accelerations (Brandt, 2021) J/MNRAS/505/5340 : Lithium-rich stars in the GALAH survey DR3 (Martell+, 2021) J/A+A/653/A72 : Stellar param. and Li abund. from GES iDR6 (Romano+, 2021) J/AJ/161/128 : Abundances of 15 red giant stars with HPF (Sneden+, 2021) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 24 A24 --- Name Star name 26- 35 A10 --- OName Star indentifier in HD or BD catalog 37- 41 F5.2 mag Vmag [3.36/14.31]? SIMBAD Apparent V magnitude 43- 46 F4.2 mag B-V [0/1.86]? SIMBAD (B-V) color 48- 51 F4.2 mag V-J [0.48/3.55]? SIMBAD (V-J) color 53- 58 F6.3 mas plx [0.19/55] Gaia EDR3 parallax 60- 63 F4.1 --- log(e(Li)) [-1.8/4.5]? Lithium abundance 65- 66 I2 --- r_log(e(Li)) [1/24] Literature source code (1) 68- 71 I4 0.1nm EWHe [20/2434] Equivalent width of HeI 18030{AA} line in Angstroms 73- 78 F6.2 km/s Broad [0.22/140] Line broadening (2) -------------------------------------------------------------------------------- Note (1): Reference as follows: 1 = Bozkurt et al. 2022 (to be submitted) 2 = Adamow et al. 2014, J/A+A/569/A55 3 = Mott et al. (2017A&A...604A..44M) 4 = Kumar et al. (2011ApJ...730L..12K) 5 = Brown et al. (1989ApJS...71..293B) 6 = Wallerstein & Sneden (1982ApJ...255..577W) 7 = Adamow et al. (2015A&A...581A..94A) 8 = Balachandran et al. (2000ApJ...542..978B) 9 = Hanni (1984SvAL...10...51H) 10 = Deepak & Reddy 2019, J/MNRAS/484/2000 11 = Adamow et al. 2018, J/A+A/613/A47 12 = Luck (1982PASP...94..811L) 13 = Singh et al. (2019ApJ...878L..21S) 14 = Zhou et al. (2018A&A...615A..74Z) 15 = Reddy & Lambert (2016A&A...589A..57R) 16 = de Laverny et al. (2003A&A...410..937D) 17 = Yan et al. (2018NatAs...2..790Y) 18 = Singh et al. (2019MNRAS.482.3822S) 19 = Singh et al. (2021ApJ...913L...4S) 20 = Bizyaev et al. 2010, J/AJ/140/1911 21 = Carlberg et al. 2012, J/ApJ/757/109 22 = Costa et al. (2015ApJ...807L..21C) 23 = Yan et al. (2021NatAs...5...86Y) 24 = Nagarajan et al. 2023, J/AJ/165/245 Note (2): If Broad<1km/s, then it is the Gaussian FWHM; otherwised it is the rotational vsin(i) value. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Sep-2024