Pulsation-triggered dust production by asymptotic giant branch stars

Abstract

Eleven nearby (<300 pc), short-period (50-130 days) asymptotic giant branch (AGB) stars were observed in the CO J = (2-1) line. Detections were made towards objects that have evidence for dust production (Ks-[22] >~ 0.55 mag; AK Hya, V744 Cen, RU Crt, alpha Her). Stars below this limit were not detected (BQ Gem, eps Oct, NU Pav, II Hya, CL Hyi, ET Vir, SX Pav). Ks-[22] colour is found to trace mass-loss rate to well within an order of magnitude. This confirms existing results, indicating a factor of 100 increase in AGB-star mass-loss rates at a pulsation period of ~60 days, similar to the known "superwind" trigger at ~300 days. Between ~60 and ~300 days, an approximately constant mass-loss rate and wind velocity of ~3.7 x 10^-7 solar masses per year and ~8 km/s is found. While this has not been corrected for observational biases, this rapid increase in mass-loss rate suggests a need to recalibrate the treatment of AGB mass loss in stellar evolution models. The comparative lack of correlation between mass-loss rate and luminosity (for L <~ 6300 solar luminosities) suggests that the mass-loss rates of low-luminosity AGB-star winds are set predominantly by pulsations, not radiation pressure on dust, which sets only the outflow velocity. We predict that mass-loss rates from low-luminosity AGB stars, which exhibit optically thin winds, should be largely independent of metallicity, but may be strongly dependent on stellar mass.

18 pages, 7 figures, accepted for publication in MNRAS

References in corpus (37)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Too little radiation pressure on dust in the winds of oxygen-rich AGB stars
• A close halo of large transparent grains around extreme red giant stars
• Unexpectedly large mass loss during the thermal pulse cycle of the red giant R Sculptoris!
• The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity
• Fundamental parameters and infrared excesses of Tycho-Gaia stars
• Mass loss on the red giant branch: the value and metallicity dependence of Reimers' η in globular clusters
• The pulsation modes, masses and evolution of luminous red giants
• ALMA data suggest the presence of a spiral structure in the inner wind of CW Leo
• Giants in the globular cluster omega Centauri: dust production, mass loss and distance
• ALMA observations of the nearby AGB star L2 Puppis - I. Mass of the central star and detection of a candidate planet
• The wonderful complexity of the Mira AB system
• An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS), II. Discovery of Metal-poor Dusty AGB Stars
• A critical test of empirical mass loss formulae applied to individual giants and supergiants
• Spitzer Infrared Spectrographic point source classification in the Small Magellanic Cloud
• Exploring wind-driving dust species in cool luminous giants III. Wind models for M-type AGB stars: dynamic and photometric properties
• The trigger of the AGB superwind: the importance of carbon
• Mass Outflow from Red Giant Stars in M13, M15, and M92
• ALMA Observations of Anisotropic Dust Mass-loss in the Inner Circumstellar Environment of the Red Supergiant VY Canis Majoris
• ALMA sub-mm maser and dust distribution of VY Canis Majoris
• An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). IV. Discovery of High-Redshift AGB Analogs
• Ejection of globular cluster interstellar media through ionization by white dwarfs
• Spitzer Space Telescope evidence in NGC 6791: no super-mass-loss at super-solar metallicity to explain helium white dwarfs?
• An unusual face-on spiral in the wind of the M-type AGB star EP Aquarii
• Mass Outflow and Chromospheric Activity of Red Giant Stars in Globular Clusters I: M15
• Dissecting the AGB star L2 Puppis: a torus in the making
• The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud
• The photodissociation of CO in circumstellar envelopes
• Semi-Regular Variables in the Solar Neighbourhood
• Abundance analysis for long-period variables II. RGB and AGB stars in the globular cluster 47\,Tuc
• ALMA observations of the nearby AGB star L${}_2$ Puppis. II. Gas disk properties derived from ${}^{12}$CO and ${}^{13}$CO $J=$3$-$2 emission
• The detached dust shells around the carbon AGB stars R Scl and V644 Sco
• The mass-loss rates of red supergiants at low metallicity: Detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud
• Mid-IR period-magnitude relations for AGB stars
• HI and CO in the circumstellar environment of the oxygen-rich AGB star RX Lep

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• Circumstellar CO in metal-poor stellar winds: the highly irradiated globular cluster star 47 Tucanae V3
• Meandering periods and asymmetries in light curves of Miras: Observational evidence for low mass-loss rates
• Stellar Pulsation and the Production of Dust and Molecules in Galactic Carbon Stars
• A detailed view on the circumstellar environment of the M-type AGB star EP Aquarii I. High-resolution ALMA and SPHERE observations
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• The Nearby Evolved Stars Survey II: Constructing a volume-limited sample and first results from the James Clerk Maxwell Telescope
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