An Astronomer Plots the H-R Diagram of a Star Cluster

question 218

Multiple Choice

An astronomer plots the H-R diagram of a star cluster and finds that it contains hot B-type stars on the main sequence and cooler G- and K-type stars noticeably above the main sequence. This cluster is

• A) of indeterminate age since the age of the cluster cannot be estimated from the information given.
• B) impossible because cool stars cannot be above the main sequence when hot stars are on the main sequence.
• C) old because the G and K stars are already evolving off (away from) the main sequence.
• D) very young because the G and K stars are still evolving toward the main sequence.

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Definitions:

Anxious Category

A classification or group characterized by anxiety, often used in the context of attachment styles or personality types.

Avoidant Attachment

The attachment pattern in which infants are indifferent to where their mother is sitting, may or may not cry when their mother leaves, are as likely to be comforted by strangers as by their mother, and are indifferent when their mother returns to the room.

Strange Situation

A psychological experiment designed by Mary Ainsworth to assess attachment styles of infants by observing their reactions to separations and reunions with their caregivers.

Strange Situation Procedure

A research method developed by Mary Ainsworth to assess patterns of attachment between a child and their caregiver through a series of introductions, separations, and reunions.