On the multiplicity of the zero-age main-sequence O star Herschel 36

Abstract

We present the analysis of high-resolution optical spectroscopic observations of the zero-age main-sequence O star Herschel 36 spanning six years. This star is definitely a multiple system, with at least three components detected in its spectrum. Based on our radial-velocity (RV) study, we propose a picture of a close massive binary and a more distant companion, most probably in wide orbit about each other. The orbital solution for the binary, whose components we identify as O9 V and B0.5 V, is characterized by a period of 1.5415 +/- 0.0006 days. With a spectral type O7.5 V, the third body is the most luminous component of the system and also presents RV variations with a period close to 498 days. Some possible hypotheses to explain the variability are briefly addressed and further observations are suggested.

arXiv comment6 pages, 2 figures

References in corpus (3)

• The Origin of Massive O-type Field Stars. Part II: Field O stars as runaways
• An Analysis of the Shapes of Interstellar Extinction Curves. VI. The Near-IR Extinction Law
• High-Resolution Infrared Imaging of Herschel 36 SE: A Showcase for the Influence of Massive Stars in Cluster Environments

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• The Villafranca catalog of Galactic OB groups. II. From Gaia DR2 to EDR3 and ten new systems with O stars
• Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
• Determination of the Galactic Rotation Curve from OB Stars
• Spectroscopic study of the extremely young O-type triple system Herschel 36 A in the Hourglass Nebula. I. Orbital properties
• Resolving the stellar components of the massive multiple system Herschel 36 with AMBER/VLTI
• Direct Detection of the Tertiary Component in the Massive Multiple HD 150 136 with VLTI
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• Observational study of hydrocarbons in the bright photodissociation region of Messier 8
• Very Large Array and Jansky Very Large Array observations of the compact radio sources in M8
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• The effects of stellar feedback on molecular clumps in the Lagoon Nebula (M8)
• The outer orbit of the high-mass stellar triple system Herschel 36 determined with the VLTI
• SDSS-V LVM: A spatially resolved study of the physical conditions and the chemical abundance discrepancy in the Lagoon Nebula (M 8)